Anatomy Flashcards
A lesion in the pulvinar nucleus of the thalamus can result in:
A. Neglect syndromes
B. Anosmia
C. Contralateral sensory loss
D. Endocrine dysfunction and abnormalities
E. Memory difficulties
A. Neglect syndromes
Neglect syndromes and attentional deficits can
occur with pulvinar nuclear lesions. The pulvinar
nucleus is the largest nucleus in the thalamus; it
is located most posteriorly, and is associated with
visual
pathways. (E) Memory difficulties may occur
with lesions of the anterior nucleus of the thalamus,
which is considered part of the limbic system.
A 67-year-old woman presents for follow-up 4 months after a stroke. She complains of her eyelids “twitching.” She is found to have palatal myoclonus on physical exam. Her stroke likely involved what region of the brain?
A. Nucleus ambiguus
B. Tectospinal tract
C. Rubro-olivary tract/central tegmental tract (triangle of Mollaret)
D. Body of the caudate nucleus
E. Lateral lemniscus
C. Rubro-olivary tract/central tegmental tract (triangle of Mollaret)
The triangle of Mollaret is a functional circuit
connecting the dentate nucleus of the cerebellum
to the contralateral red nucleus through the superior
cerebellar peduncle, the red nucleus to the ipsilateral
inferior olivary nucleus through the central
tegmental tract, the inferior olivary nucleus to the
contralateral cerebellar cortex through the inferior
cerebellar peduncle, and the cerebellar cortex to
the ipsilateral dentate nucleus. Lesions of the triangle
of Mollaret produce palatal myoclonus, which
is one of the few movement disorders that do not
disappear during sleep. Palatal myoclonus appears
in a delayed fashion following such lesions. Ocular
myoclonus can accompany palatal myoclonus due
to lesions in the central tegmental tract.
The ventral tegmental area sends projections through what neuroanatomic structure to the nucleus accumbens as part of the dopaminergic mesolimbic system (involved in reward circuitry)?
A. Medial forebrain bundle
B. Lateral hypothalamus
C. Ventral pallidum
D. Prefrontal cortex
A. Medial forebrain bundle
The medial forebrain bundle carries information
from the ventral tegmental area to the nucleus
accumbens in the ventral striatum. The nucleus
accumbens also receives input from the hippocampus,
amygdala, and prefrontal cortex with output
to the ventral pallidum.
What structure is the target for taste afferent fibers?
A. Area postrema
B. Nucleus tractus solitarius
C. Nucleus prepositus hypoglossi
D. Nucleus ambiguus
E. Inferior salivary nucleus
B. Nucleus tractus solitarius
The nucleus tractus solitarius is a medullary
nucleus
also receiving afferents from chemoreceptors
in the aortic and carotid bodies.
What structure is the autonomic center for vomiting?
A. Area postrema
B. Nucleus tractus solitarius
C. Nucleus prepositus hypoglossi
D. Nucleus ambiguus
E. Inferior salivary nucleus
A. Area postrema
The area postrema is located in the medulla and
is the only paired circumventricular organ. (C) The
nucleus prepositus hypoglossi is a medullary structure
and neural integrator responsible for horizontal
gaze control during smooth-pursuit eye movements.
(D) The nucleus ambiguus is located in the lateral
and rostral medulla and supplies the efferent motor
fibers for the glossopharyngeal and vagus nerves.
(E) The inferior salivary nucleus is a medullary
structure responsible for the parasympathetic
efferents
to the parotid gland to induce salivation.
What skin mechanoreceptors are best at sensing both rapid vibration and pressure?
A. Ruffini endings
B. Meissner corpuscles
C. Merkel disks
D. Pacinian corpuscles
E. Free nerve endings
D. Pacinian corpuscles
Pacinian corpuscles detect rapid vibrations and
have peak sensitivity with vibrations around 250
Hz. They also are keen at detecting surface texture,
which makes their localization in the skin ideal.
Additionally, they are found in internal organs.
(A) Ruffini endings are slowly adapting receptors
found in subcutaneous tissues and respond to sustained
pressure. (B) Meissner corpuscles are very
sensitive to light touch and function best with vibrations
less than 50 Hz. They rapidly adapt and
are found in areas very sensitive to light touch,
such as the finger pads. (C) Merkel disks occur in
the superficial skin layers and mucosa, and provide
information about pressure and texture. They are
slowly adapting. (E) Free nerve endings are unencapsulated
receptors in the skin that detect painful
stimuli.
In what ventricular structure is cerebrospinal fluid not produced by the choroid plexus?
A. Roof of the fourth ventricle
B. Floor of the third ventricle
C. Lateral recess of the foramen of Luschka
D. Temporal horn of the lateral ventricle
E. Roof of the third ventricle
B. Floor of the third ventricle
There is no choroid plexus along the floor of the
third ventricle. Choroid plexus is present at the
other locations and is responsible for the bulk of
cerebrospinal fluid production. Cerebrospinal fluid
is produced by bulk transependymal flow along
the floor of the third ventricle.
The deep petrosal nerve is what type of nerve with what function?
A. Sensory nerve that unites with the greater
superficial petrosal nerve to form the nerve
of the pterygoid canal
B. Sympathetic nerve that unites with the lesser
superficial petrosal nerve to form the vidian
nerve
C. Sympathetic nerve that unites with the greater superficial petrosal nerve to form the vidian nerve
D. Sensory nerve that unites with the lesser
superficial petrosal nerve to form the nerve
of the pterygoid canal
C. Sympathetic nerve that unites with the greater superficial petrosal nerve to form the vidian nerve
The deep petrosal nerve emerges from the internal
carotid plexus and traverses the carotid canal
to join the superficial petrosal nerve to form the
Vidian nerve (also known as the nerve of the pterygoid
canal). The deep petrosal nerve carries the
sympathetics that innervate the pterygopalatine
ganglion.
What nerve innervates the skin between the hallux and the second toe?
A. Superficial peroneal nerve
B. Medial dorsal cutaneous nerve
C. Intermediate dorsal cutaneous nerve
D. Deep peroneal nerve
E. Tibial nerve
D. Deep peroneal nerve
The deep peroneal nerve innervates the tibialis
anterior, extensor digitorum longus, extensor hallucis
longus, extensor digitorum brevis, and extensor
hallucis brevis, and provides cutaneous innervation
to the webbing between the first and second
toes. (A) The superficial peroneal nerve innervates
the peroneus longus and brevis, and provides cutaneous
innervation over the anterolateral leg and the
dorsum of the foot, except for the first web space.
(B) The medial dorsal cutaneous nerve divides
into three branches, and provides sensation to the
medial
side of the hallux and adjacent sides of the
second and third toes. (C) The intermediate dorsal
cutaneous nerve divides into four branches, and
supplies sensation to the medial and lateral sides
of the third, fourth, and fifth toes. (E) The tibial
nerve innervates the gastrocnemius, popliteus,
soleus,
and plantaris, and contributes to the sural
nerve. It also innervates the tibialis posterior, flexor
digitorum longus, flexor hallucis longus, sole of the
foot, and posterior lower leg.
What is another name for the medial distal striate artery?
A. Tentorial artery (of Bernasconi and Cassinari)
B. McConnell capsular artery
C. Frontopolar artery
D. Recurrent artery of Heubner
E. Medial lenticulostriate artery
D. Recurrent artery of Heubner
The recurrent artery of Heubner is the most
proximal branch of the A2 segment distal to the
anterior communicating artery. It runs in a retrograde
fashion and enters the anterior perforating
substance. (A) The tentorial artery is a branch of
the meningohypophyseal trunk that runs posteriorly
to supply blood to the tentorium. (B) The
McConnell
capsular artery/arteries arise from the
medial trunk of the intracavernous internal carotid
artery and supply blood to the pituitary
gland. They are present in only 28% of the population.
(C) The frontopolar artery is a branch of the
A2 segment that supplies blood to the medial frontal
lobe and the lateral surface of the superior frontal
gyrus. (E) The medial lenticulostriate arteries
arise from the A1 segment and supply blood to the
globus pallidus and medial putamen.
What midbrain anatomic structure is responsible for pain modulation?
A. Superior colliculus
B. Substantia nigra
C. Crus cerebri
D. Red nucleus
E. Periaqueductal gray matter
E. Periaqueductal gray matter
The periaqueductal gray matter suppresses and
modulates pain in the descending pathways within
the midbrain tegmentum. (A) The superior colliculus
functions to modulate gaze shifts. (B) The substantia
nigra contains high levels of dopamine, and
the loss of neurons in the pars compacta region
characterizes Parkinson disease. (C) The crus cerebri
is the anterior white matter portion of the cerebral
peduncle that contains the motor tracts. (D) The
red nucleus controls tone and gait.
A patient has an intractable nosebleed following transsphenoidal pituitary surgery. What artery likely is injured?
A. Middle meningeal artery
B. Infraorbital artery
C. Internal maxillary artery
D. Superior hypophyseal artery
E. Anterior ethmoidal artery
C. Internal maxillary artery
Epistaxis after transsphenoidal surgery can be
immediate
or delayed. Injury to the internal carotid
artery can cause life-threatening epistaxis, and
pseudoaneurysm formation can lead to delayed
hemorrhage, illustrating the need for an angiogram
after suspected injury. In the external carotid
system, the sphenopalatine artery, originating from
the internal maxillary artery, is the most common
branch injured during transsphenoidal surgeries.
The artery is found in the inferolateral corner of the
sphenoid ostium, and if it is injured, it can retract
toward the maxilla and be difficult to coagulate.
A patient presents with a winged scapula. What other nerve besides the long thoracic and dorsal scapular nerves may be injured?
A. Suprascapular nerve
B. Spinal accessory nerve
C. Thoracodorsal nerve
D. Lateral thoracic nerve
B. Spinal accessory nerve
The long thoracic nerve provides innervation
to the serratus anterior and is the most common
cause of scapular winging. Its origin is the C5-C7
nerve roots. The dorsal scapular nerve (arising
from the C5 root) innervates the rhomboids and
levator scapulae. The spinal accessory nerve
innervates
the trapezius and sternocleidomastoid.
Injury to any of these three nerves can cause
a winged scapula. (A) The suprascapular nerve
innervates
the supraspinatus and infraspinatus.
It is a branch of the upper trunk of the brachial
plexus. (C) The thoracodorsal nerve emerges from
the posterior cord and innervates the latissimus
dorsi. (D) The lateral thoracic nerve does not exist.
What leptomeningeal structure is composed only of a single layer?
A. Intracranial dura
B. Spinal dura
C. Pia mater
D. Arachnoid
B. Spinal dura
C is the location of the lateral component of the
spinothalamic tracts. (A) A is the location of the
dorsal columns. (B) B is the location of the anterior
portion of the corticospinal tracts. (D) D is the
location
of the lateral corticospinal tracts. (E) E is
the location of the reticulospinal tracts.
In this spinal cord cross-sectional image, what letter corresponds to the location of the spinothalamic tract?
A. A
B. B
C. C
D. D
E. E
C. C
The supplementary motor area is found at what location:
A. Along the midline surface of the cerebral
hemisphere just anterior to the primary motor**
cortex leg area
B. In the parietal operculum just rostral to the
lateral sulcus
C. Along the lateral surface of the cerebral hemi-
sphere just anterior to the primary motor
cortex arm area
D. Within the pars opercularis and pars triangu-
laris of the inferior frontal gyrus
E. Along the medial surface of the cerebral hemi-
sphere continuous with the postcentral gyrus
of the parietal lobe
A. Along the midline surface of the cerebral
hemisphere just anterior to the primary motor**
cortex leg area
Injury or irritation of the supplementary motor
area produces a paucity of volitional movements
along with a contralateral hemineglect and apraxias.
Typically these symptoms resolve in a week or
two when they are due to supplementary motor
area damage, whereas the symptoms tend to be
long standing when they are due to damage of the
motor cortex. (B) The secondary somatosensory
area is found in the parietal operculum. (C) The
premotor cortex is in Brodmann area 6 on the lateral
surface of the cerebral hemisphere. The medical
extension of this area is the supplementary
motor area. (D) The Broca area is within the pars
opercularis and pars triangularis of the inferior
frontal gyrus. (E) The paracentral lobule of the
parietal
lobule lies along the medial surface of
the cerebral hemisphere and is continuous with the
postcentral gyrus of the parietal lobe. The anterior
component of this (the medial surface of the precentral
gyrus) is the supplementary motor area.
Which structure runs through the petrotympanic fissure?
A. Pterygoid artery
B. Posterior deep temporal artery
C. Chorda tympani
D. Lingual nerve
E. Greater superficial petrosal nerve
C. Chorda tympani
The petrotympanic fissure is located between the
temporomandibular joint and the middle ear to
enable communication between these structures.
It opens just anterior and superior to the tympanic
membrane, and houses the anterior malleus ligament,
anterior tympanic branch of the internal
maxillary artery, and chorda tympani. (A) The pterygoid
artery is a branch of the second part of the
internal maxillary artery and supplies blood to
the medial and lateral pterygoid muscles. (B) The
posterior deep temporal artery is a branch of the
second part of the internal maxillary artery and
supplies blood to the temporalis muscle. (D) The
chorda tympani does not join with the lingual
nerve until after it emerges from the skull through
the infratemporal fossa. (E) The greater superficial
petrosal nerve travels over the surface of the foramen
lacerum and joins the deep petrosal nerve to
form the nerve of the pterygoid canal (Vidian
nerve).
Which bone does not contribute to both the orbit and nasal septum?
A. Frontal bone
B. Ethmoid bone
C. Maxillary bone
D. Palatine bone
A. Frontal bone
The orbit is made up of seven bones: pars orbitalis
of the frontal, lacrimal, lamina papyracea
of the ethmoid, zygomatic, maxillary, palatine, and
greater and lesser wings of the sphenoid. The nasal
septum is composed of five bones and structures:
perpendicular plate of the ethmoid, vomer, septum
cartilage, maxillary, and palatine.
In the hand, what muscles are innervated by the median nerve?
A. Abductor pollicis brevis
B. Lumbricals 3 and 4
C. Adductor pollicis
D. Opponens digiti minimi
E. Abductor pollicis longus
A. Abductor pollicis brevis
The median nerve originates from the C5-T1
roots. In the hand, the median nerve innervates
the “LOAF” muscles (lumbricals 1 and 2, opponens
pollicis, abductor pollicis brevis, and flexor pollicis
brevis). The ulnar nerve innervates the opponens
digiti minimi, flexor digiti minimi brevis, abductor
digiti minimi, lumbricals 3 and 4, interossei, and
adductor pollicis. The radial nerve innervates the
extensors (digitorum, digiti minimi, carpi ulnaris,
pollicis brevis, pollicis longus, and pollicis indicis)
as well as the abductor pollicis longus.
Embryologically, the pituitary is composed of the adenohypophysis and neurohypophysis. Rathke cleft cysts are derived from the persistence of what primary germ layer?
A. Ectoderm
B. Neuroectoderm
C. Mesoderm
D. Endoderm
A. Ectoderm
The pituitary is derived from the dual ectoderm.
Around day 28 of embryogenesis, the Rathke pouch
arises from a diverticulum from the stomodeum,
which is derived from the ectoderm. The infundibulum
arises from the neuroectoderm and grows
inferiorly, where it eventually contacts the Rathke
pouch. By the fifth week of embryogenesis, the
neck of the Rathke pouch contacts the infundibulum
and separates from the oral epithelium. The
residual lumen of the Rathke pouch narrows to
form a cleft and regresses. Persistence of the pouch
is considered to be the cause of a Rathke cleft cyst.
The inferior aspect of the cuneus is bounded by what structure?
A. Tentorium
B. Parieto-occipital sulcus
C. Lingual gyrus
D. Collateral eminence
E. Calcarine sulcus
E. Calcarine sulcus
The cuneus (Brodmann area 17) is the primary
visual cortex and is bounded anteriorly by the
parieto-
occipital sulcus and inferiorly by the calcarine
sulcus. (C) The lingual gyrus lies between the
calcarine sulcus and posterior part of the collateral
sulcus and contributes to Brodmann area 19.
(D) The collateral eminence is found in the lateral
aspect of the occipital horn and is a result of invagination
of the collateral sulcus.
From superior to inferior (rostral to caudal), what are the correct layers, in order, of the roof of the third ventricle?
A. Fornix, tela choroidea, velum interpositum, tela
choroidea, and choroid plexus
B. Choroid plexus, velum interpositum, tela cho-
roidea, and fornix
C. Fornix, velum interpositum, tela choroidea,
choroid plexus, and tela choroidea
D. Tela choroidea, fornix, tela choroidea, velum
interpositum, and choroid plexus
E. Fornix, velum interpositum, and choroid plexus
A. Fornix, tela choroidea, velum interpositum, tela
choroidea, and choroid plexus
The tela choroidea is composed of pia that sits on
the velum interpositum (the potential space containing
the internal cerebral veins). Failure of closure
of the posterior end of this potential space
results in a cavum velum interpositum that communicates
with the quadrigeminal cistern.
What structure courses between the petrous temporal bone and basilar part of the occipital bone and drains blood from the cavernous sinus to the sigmoid sinus?
A. Superior petrosal sinus
B. Inferior petrosal sinus
C. Vein of Labbé
D. Basal vein of Rosenthal
E. Straight sinus
B. Inferior petrosal sinus
The inferior petrosal sinus drains into the sigmoid
sinus/jugular vein. (A) The superior petrosal
sinus runs along edge of the tentorium and drains
into the transverse sinus. (C) The vein of Labbé is a
superficial vein that anastomoses the middle cerebral
vein with the transverse sinus. (D) The basal
vein of Rosenthal begins in the anterior perforated
substance and receives contributions from the
anterior cerebral vein, deep sylvian vein, and inferior
striate veins. The basal vein of Rosenthal then
passes around the cerebral peduncle to drain blood
into the vein of Galen. (E) The straight sinus is the
union of the vein of Galen and inferior sagittal sinus
and drains into the torcular/transverse sinus.
Which structure primarily is responsible for carrying input to the cerebellum from the contralateral cerebral cortex?
A. Inferior cerebellar peduncle
B. Middle cerebellar peduncle
C. Superior cerebellar peduncle
D. Cerebral peduncle
B. Middle cerebellar peduncle
Corticopontine fibers project through the middle
cerebellar peduncle (brachium pontis) along
pontocerebellar fibers. (A) The inferior cerebellar
peduncle (restiform and juxtarestiform bodies)
receives signals from the spinocerebellar tract, olivary
nucleus, and vestibular nuclei. (C) Most fibers
emerging from the cerebellum do so through the
superior cerebellar peduncle (brachium conjunctivum)
and then synapse on the red nucleus or
motor nuclei of the thalamus.
What structure in the medial limbic circuit is the major output of the thalamus?
A. Hippocampus
B. Amygdala
C. Fornix
D. Entorhinal cortex
E. Cingulate gyrus
E. Cingulate gyrus
The medial limbic circuit also is known as the
Papez circuit. It essentially is the limbic system circuitry.
The Papez circuit begins in the hippocampus
(subiculum) and then projects to the fornix
followed by the mammillary bodies. The mammillary
bodies project along the mammillothalamic
tract to the anterior thalamic nucleus and then to
the cingulum followed by the entorhinal cortex.
The circuit is completed as the entorhinal cortex
projects back to the hippocampus.
What is an accurate description of the location of the flocculonodular lobe of the cerebellum?
A. Rostral to the primary fissure
B. Caudal to the primary fissure
C. Anterior to and between the anterior and posterior cerebellar lobes
D. Midsagittal
E. Rostral to the anterior lobe and posterior to the
sylvian aqueduct
C. Anterior to and between the anterior and posterior cerebellar lobes
The flocculonodular lobe is part of the vestibulocerebellum
and is involved with maintenance of
posture. (A) The anterior lobe is rostral to the primary
fissure. (B) The posterior lobe is caudal to
the primary fissure. (D) The vermis is located in a
midsagittal position. (E) The tectum of the midbrain
is rostral to the anterior lobe and posterior to
the sylvian aqueduct.
Afferents to the subthalamic nucleus originate in what structure?
A. Thalamus
B. Red nucleus
C. Globus pallidus
D. Cerebellum
E. Substantia innominata
C. Globus pallidus
The globus pallidus sends afferents to the subthalamic
nucleus, which also receives fewer afferents
from the substantia nigra pars compacta and
pedunculopontine nucleus.
The lateral cord of the brachial plexus is formed from what structure(s)?
A. Anterior divisions of the upper and middle
trunks
B. Nerve roots C5, C6, and C7
C. Posterior divisions of the superior, middle, and
inferior trunks
D. Anterior division of the inferior trunk
E. Posterior division of the superior trunk
A. Anterior divisions of the upper and middle
trunks
The lateral cord is derived from the anterior divisions
of the superior and middle trunks. (C) The
posterior cord is formed from the posterior divisions
of the superior, middle, and inferior trunks.
(D) The medial cord is formed from the anterior
division of the inferior trunk.
The ventral posterior nucleus of the thalamus sends information to which Brodmann area(s)?
A. Areas 1, 2, and 3
B. Area 4
C. Area 17
D. Areas 39 and 40
E. Area 44
A. Areas 1, 2, and 3
The ventral posterior nucleus is subdivided into
the ventral posterior lateral nucleus and the ventral
posterior medial nucleus, which receive afferent
sensory information from the medial lemniscus/
spinothalamic tract and trigeminothalamic tract,
respectively. These nuclei then send projections to
the primary somatosensory cortex in the postcentral
gyrus (Brodmann areas 1, 2, and 3). (B) Brodmann
area 4 is the primary motor cortex in the
precentral gyrus. (C) Brodmann area 17 is the primary
visual cortex in the occipital lobe. (D) Brodmann
areas 39 and 40 are the angular gyrus and
supramarginal gyrus, respectively, and represent
the Wernicke area. (E) Brodmann area 44 is the
pars opercularis of the inferior frontal gyrus and
represents the Broca area.
The sural nerve provides sensation to the posterolateral surface of the leg, lateral foot, and the fifth toe. It is formed by contributions from which nerve(s)?
A. Tibial nerve
B. Common peroneal nerve
C. Tibial and common peroneal nerves
D. Superficial peroneal nerve
E. Tibial and superficial peroneal nerves
C. Tibial and common peroneal nerves
The sural nerve is composed of contributions
from the medial cutaneous branch arising from
the tibial nerve and the lateral cutaneous branch
arising from the common peroneal nerve.
If the facial nerve is sectioned just proximal to the nerve to the stapedius, what clinical finding would be expected other than paresis of the facial musculature?
A. Decreased lacrimation
B. Decreased taste in the anterior two thirds of
the tongue
C. Increased salivation
D. Decreased sensation in the nasopharynx and
palate mucous membranes
B. Decreased taste in the anterior two thirds of
the tongue
Facial nerve branches distal to the nerve to the
stapedius include the chorda tympani, which serves
to provide taste to the anterior two thirds of the
tongue. (A) The greater petrosal nerve is the first
branch of the facial nerve distal to the geniculate
ganglion (proximal to the emergence of the nerve
to the stapedius). The greater petrosal nerve
innervates
the lacrimal gland after sending fibers
through the zygomatic nerve. (C) Decreased salivation
would be expected as the facial nerve innervates
the submandibular and sublingual glands
through the chorda tympani. (D) The nervus intermedius
provides the sensory and parasympathetic
components for cranial nerve VII. It joins the motor
root of the nerve at the geniculate ganglion and
provides minor sensory innervation to the oropharynx
and auricle.
What muscle is innervated by the anterior interosseous nerve?
A. Flexor pollicis brevis
B. Abductor pollicis brevis
C. Flexor carpi radialis
D. Pronator quadratus
E. Abductor pollicis longus
D. Pronator quadratus
The anterior interosseous nerve is a branch of
the median nerve and classically innervates two
and a half muscles: the flexor pollicis longus, pronator
quadratus, and radial half of flexor digitorum
profundus. It contains no sensory fibers. (A–C) The
median nerve proper innervates the flexor pollicis
brevis, abductor pollicis brevis, and flexor carpi
radialis. (E) The abductor pollicis longus is innervated
by the posterior interosseous nerve from the
radial nerve.
Brodmann area 39 may be considered part of what cortical area?
A. Broca area
B. Visual cortex
C. Somatosensory association cortex
D. Wernicke area
E. Auditory cortex
D. Wernicke area
The Wernicke area often is localized to the angular
gyrus on the banks of the superior temporal
sulcus and the supramarginal gyrus found on the
banks of the sylvian fissure (Brodmann areas 39
and 40, respectively). Some neuroanatomists also
consider the posterior part of Brodmann area 22
(the superior temporal gyrus) to be a part of the
Wernicke area. (A) The Broca area is Brodmann
area 44 and consists of the pars opercularis of the
inferior frontal gyrus and, included by some neuroanatomists,
the pars triangularis (Brodmann area
45). (B) The primary visual cortex is Brodmann
area 17, whereas Brodmann area 18 is the secondary
visual cortex. (C) The somatosensory association
cortex is Brodmann area 7. (E) Brodmann area
22 along with the more medially located Brodmann
area 41 (the Heschl gyrus) are the primary
auditory cortex.
The inferior leaflet of the Liliequist membrane separates the interpeduncular from the prepontine cistern. The superior leaflet separates which two cisterns medially?
A. Chiasmatic and crural cisterns
B. Interpeduncular and crural cisterns
C. Interpeduncular and chiasmatic cisterns
D. Ambient and quadrigeminal cisterns
E. Interpeduncular and ambient cisterns
C. Interpeduncular and chiasmatic cisterns
The Liliequist membrane separates the interpeduncular
from the chiasmatic cistern medially
and the carotid cistern laterally. Blood in the chiasmatic
cistern should raise concern for aneurysmal
rupture.