⭐️ ANATOMY Flashcards
Layers of the scalp
SCALPskin, connective tissue of superficial fascia, aponeurosis, loose connective tissue, periosteum
Danger zone of the scalp
4th layer loose connective tissueD for danger - 4th letter of the alphabetContains potential space that may distend with injury or infection
8 bones of the cranium
Frontal, parietal (2), occipital, temporal (2), sphenoid, ethmoid
Immovable fibrous joints that connect skull bones
Sutures
Thinnest part of the calvariumwhich is superficial to the anterior branch of the middle meningeal artery
Pterion
Type of injury that arises when rupture of the middle meningela artery happens (pterion)
Epidural hematoma
Junction of frontal and sagittal sutures
Bregma
Junction of sagittal and lambdoidal sutures
Lambda
Separation of external and internal compact bones in the calvarium primarily made of spongy bone
Diploe
The cranial base is divided into three compartments namely:
Anterior, middle, and posterior cranial fossa
Bones of the cranial base
Mnemonic: STEP OFf my skullSphenoid, temporal, ethmoid, parietal, occipital, frontal
Cranial fossa challenge. Name the fossa, bone in which the aperture is located, and contents: Cribriform plate
AnteriorEthmoidCN 1
Cranial fossa challenge. Name the fossa, bone in which the aperture is located, and contents: Optic canal
MiddleLesser wing of sphenoidCN II and Ophthalmic Artery
Cranial fossa challenge. Name the fossa, bone in which the aperture is located, and contents: Superior orbital fissure
MiddleBetween lesser and greater wingCN III IV VI V1 and Superior ophthalmic vein
Cranial fossa challenge. Name the fossa, bone in which the aperture is located, and contents: Foramen rotundum
MiddleGreater wing of sphenoidCN V2
Cranial fossa challenge. Name the fossa, bone in which the aperture is located, and contents: Foramen spinosum
MiddleGreater wing of sphenoid
CN V3 mandibular branch, lesser petrosal nerve, accessory meningeal artery
Cranial fossa challenge. Name the fossa, bone in which the aperture is located, and contents: Foramen lacerum
MiddlePetrous, temporal, and sphenoidInternal carotid artery
Cranial fossa challenge. Name the fossa, bone in which the aperture is located, and contents: Foramen magnum
PosteriorOccipitalSpinal accessory, medulla, vertebral arteries
Cranial fossa challenge. Name the fossa, bone in which the aperture is located, and contents: Hypoglossal canal
PosteriorHypoglossal nerve
Cranial fossa challenge. Name the fossa, bone in which the aperture is located, and contents: Jugular foramen
PosteriorTemporal and occipitalCN IX X XI, internal jugular vein
Cranial fossa challenge. Name the fossa, bone in which the aperture is located, and contents: Internal acoustic meatus
PosteriorTemporalCN VII VIII
Exits of the branches of the trigeminal nerve
Mnemonic: 1, 2, 3 and FRO1 s o F2 f R3 f O
Most common facial fracture
Nasal fracture
Most common fossa fractured in basilar skull fracture
Middle cranial fossa
2 signs in basilar skull fracture
Raccoon eyes- periorbital ecchymosesBattle sign - mastoid ecchymoses
Mastoid processes are absent at birth. When do they develop?
First 2 years of life
Closure of anterior fontanelle
9-18mos
Closure of posterior fontanelle
3-4 mos
Meningeal layers from outside to inside
Dura - arachnoid - pia
Vessels traversing epidural versus subdural spaces
Epidural - meningeal artery
Subdural - cerebral bridging veins
Space where csf circulates
Subarachnoid space
Dura matter layers
Outer periosteal layer - closely applied to inner surface of skull and firmly attached to sutures
Inner meningeal layer - continuous with dura of vertebrl canal
Meningeal dural septae - falx, tentorium, diaphragma sellae
Innervation of dura matter
Meningeal branches of CN V, C1-C3, vagus nerve (latter 2 innervate posterior cranial fossa dura)
Neuroanatomic area: postcentral gyrus (primary somatosensory area)
Name the Brodman area and function.
Brodman 3, 1, 2
Sensory area for pain, temperaturem, touch, and pressure from the contralateral side of the body
Neuroanatomic area: precentral gyrus or primary motor area
Name the Brodman area and function.
Brodman 4
Voluntary movements on contralateral side
Neuroanatomic area: secondary motor area
Name the Brodman area and function.
Brodman 6
Supplements motor area
Neuroanatomic area: Secondary somatosensory area
Name the Brodman area and function.
5, 7
Supplements somatosensory area
Neuroanatomic area: primary visual area
Name the Brodman area and function.
Brodman 17
Receives visual impressions
Neuroanatomic area: visual association area
Name the Brodman area and function.
Brodman 18, 19
Supplements primary visual area
Neuroanatomic area: superior tempory gyrus of Heschl or Primary auditory area
Name the Brodman area and function.
Brodman 41, 42
Reception and interpretation of sound
Neuroanatomic area: broca’s speech area
Name the Brodman area and function.
Brodman 44, 45
Controls faculties needed to produce speech
Neuroanatomic area: wernicke’s area
Name the Brodman area and function.
Brodman 22
Understanding of written and spoken language
Neuroanatomic area: angular gyrus
Name the Brodman area and function.
Brodman 39
Involved in language, spatial cognition, calculation, memory retrieval and attention
The motor homonculus is a representation of the body wherein the nerves that control the feet are located in the UPPER part and the movements of the face and hands are in the LOWER part.
True or False.
True.
The thalamus is a relay station of afferent sensory pathway to the cerebral cortex except the
Olfactory nerve
What is the function of the hypothalamus?
Controls endocrine stimulation of the pituitary gland (temperature, thirst, hunger, water balance, sexual function)
What structures comprise the limbic system?
Hippocampus Amygdala Mamillary bodies Anterior thalamic nucleus Sucallosal, cingulate, and parahippocampal gyri
What is the function of the basal ganglia?
Controls voluntary movements at subconscious levels
What are the parts of the basal ganglia?
Caudate nucleus
putamen
globus pallidus
What are the functions of the limbic system?
Mnemonic: 5Fs
Feeding, flight, fight, feelings, fucking (sexual function)
Pigmented band of gray matter in the midbrain
Substantia nigra
Lateral halves of the midbrain
Cerebral peduncles
Anterior part of the midbrain
Crus cerebri
Posterior part of the midbrain
Tectum and tegmentum
Which part of the brainstem contains the connecting fibers of the two halves of the cerebellum?
Pons
Place where the decussation of the corticospinal tracts occur
Medullary pyramids
Functions of the medulla oblongata
Controls heart rate, respiration, blood vessel compliance, and swallowing
Cerebrum:corpus callosum
Cerebellum:?
Cerebellar vermis
Part of the cerebellum that connects with the midbrain
Superior cerebellar peduncle
Part of the cerebellum that connects with the pons
Middle cerebellar peduncle
Part of the cerebellum that connects with the medulla
Inferior cereballar peduncle
Flow of csf
Choroid plexus - lateral ventricles - foramen of monro - 3rd ventricle - aqueduct of sylvius - 4th ventricle - foramina of Luschka (lateral) and Magendie (medial) - subarachnoid space - reabsorbed by arachnoid granulations
2 types of hydrocephalus
Communicating and non-communicating
C- concerned with overproduction or defective reabsorption of csf
NC - obstruction
Draw the circle of willis
On paper
The union of the 2 vertebral arteries form the
Basilar artery
The labyrinthine artery is a branch of the
Basilar
Draw and enumerate the dural venous sinuses
Use paper
What infection is termed as the danger triangle of the face?
Cavernous sinus thrombosis
What are the contents of the cavernous sinus
Mnemonic: OTOM CAt
Oculomotor nerve, trochler, ophthalmic nerve, maxilarry nerve, carotid artery, abducens nerve
The articular disc of the temporomandibular joint divides it into 2 cavities namely
Superior and inferior part
Movements of the superior part of the TMJ
Protrusion and retrusion
Movement of the inferior part of the TMJ
Elevation, depression
2 muscle groups of the face
Muscles of mastication and muscles of facial expressions
All muscles of mastication are found within the infratemporsl fossa except the
Masseter
Main branches of the maxillary artery
Middle meningeal
Inferior alveolar
Deep temporal
The taste fibers of the anterior 2/3 of the tongue is supplied by the
Chorda tympani of CN VII
C2 innervtes the angle of the mandible. True or false.
True
2 ganglia from the facial nerve
Geniculate - taste fibers from the anterior 2/3 of the tongue
Pterygopalatine - parasympathetic fibers to submandibular and sublingul glands via the chorda tympani
Differentiate the 3 types of le fort fractures
Le Fort I fractures (horizontal) may result from a force of injury directed low on the maxillary alveolar rim in a downward direction. It is also known as a Guérin fracture or ‘floating palate’, and usually involves the inferior nasal aperture. The fracture extends from the nasal septum to the lateral pyriform rims, travels horizontally above the teeth apices, crosses below the zygomaticomaxillary junction, and traverses the pterygomaxillary junction to interrupt the pterygoid plates.
LeFort II fracture
Le Fort II fractures (pyramidal) may result from a blow to the lower or mid maxilla and usually involve the inferior orbital rim. Such a fracture has a pyramidal shape and extends from the nasal bridge at or below the nasofrontal suture through the frontal processes of the maxilla, inferolaterally through the lacrimal bones and inferior orbital floor and rim through or near the inferior orbital foramen, and inferiorly through the anterior wall of the maxillary sinus; it then travels under the zygoma, across the pterygomaxillary fissure, and through the pterygoid plates.
LeFort III fracture
Le Fort III fractures (transverse) are otherwise known as craniofacial dissociation and involve the zygomatic arch. These may follow impact to the nasal bridge or upper maxilla. These fractures start at the nasofrontal and frontomaxillary sutures and extend posteriorly along the medial wall of the orbit through the nasolacrimal groove and ethmoid bones. The thicker sphenoid bone posteriorly usually prevents continuation of the fracture into the optic canal. Instead, the fracture continues along the floor of the orbit along the inferior orbital fissure and continues superolaterally through the lateral orbital wall, through the zygomaticofrontal junction and the zygomatic arch. Intranasally, a branch of the fracture extends through the base of the perpendicular plate of the ethmoid, through the vomer, and through the interface of the pterygoid plates to the base of the sphenoid. This type of fracture predisposes the patient to CSF rhinorrhea more commonly than the other types.
Aperture exits of the facial nerve
- Hiatus of facial canal
- Petrotympanic fissure
- Stylomastoid foramen