Veterinary anatomy: peripheral nervous system Flashcards
Peripheral nervous system
systema nervosum periphericum
How many cranial nerves are there and where do they originate from?
the cranial nerves are 12 pairs of nerves that originate from the undersurface of the brain
The peripheral nervous system consists of
cranial and spinal nerves,
the autonomic nervous system,
and the ganglia
the autonomic nervous system is that part of the peripheral nervous system that innervates smooth muscle, cardiac muscle, and glands
Cranial nerves
nervi craniales
what nerves comprise the vagal group?
where do they exit the skull?
nerves IX, X, and XI form the vagal group
(glossopharyngeal, vagus, accessory)
exit the skull through the foramen jugulare
(in eq, su its called foramen lacerum)
cranial nerve I
latin
english
type of fiber
nn. olfactorii
olfactory nerve(s) I
sensory
where is the primary cortical olfactory area
the piriform lobe of the cerebrum
cribriform plate
lamina cribrosa
of os ethmoidale
cranial nerve II
latin
english
type of fiber
originates?
n. opticus
II optic nerve
sensory
originates from optic chiasm
the optic nerve transmits visual information from the photoreceptors of the retina through what to what
through the optic canal to the thalamic nuclei in interbrain from the photoreceptors of the retina
where is the visual cerebral cortex located?
in occipital lobe of the cerebrum
cranial nerve III
latin
english
type of fiber
originates?
n. oculomotorius
III oculomotor nerve
motor and parasympathetic sensory fibres
from the tegmentum of the midbrain
which foramen does cranial nerve III pass through?
passes through the fissura orbitalis in car, eq
or foramen orbitorotundum in Ru, su
which foramen does cranial nerve II pass through?
foramen optici/opticum according to some sources
but definitely canalis opticus
what does cranial nerve I innervate?
olfactory epithelium -> olfactory bulb of the cerebrum
what does cranial nerve III control?
most of the eye’s movements, including constriction of the pupil
and maintaining an open eyelid
cranial nerve IV
latin
english
type of fiber
originates?
n. trochlearis
IV trochlear nerve
motor
arises from tegmentum of the midbrain
what does cranial nerve IV innervate?
a dorsal oblique muscle of the eye
which foramen does cranial nerve IV pass through?
arises from tegmentum of the midbrain and
passes through the fissura orbitalis in car, eq
or foramen orbitorotundum in Ru, su
cranial nerve V
latin
english
type of fiber
originates?
n. trigeminus
V trigeminal nerve
mixed (motor & sensory) fibres arise from hindbrain
+symphathetic fibres to the cranial glands
originates from hindbrain
consists of 3 branches & is the largest cranial nerve
what does cranial nerve V innervate?
sensation in the face and deeper tissues of the face,
certain motor functions (chewing) and
carries symphathetic fibres to the cranial glands
what 3 branches does cranial nerve V consist of?
n. ophthalmicus
n. maxillaris
n. mandibularis
ophthalmic nerve
latin
related to which cranial n.?
function?
divide into? (3)
n. ophthalmicus
V-1
carries sensory information from the upper rostral portion of the head
(forehead, the frontal sinus, the horns, the eye, the nose and parts of the meninges)
divides into
n. frontalis
n. lacrimalis
n. nasociliaris
maxillary nerve
latin
related to which cranial n.?
function?
divide into? (3)
n. maxillaris
V-2
carries sensory information from the cheeks, the nares, the eyes, the horn in bo, upper teeth and gums, nasal mucosa, the roof of the pharynx, the sinuses, and the meninges
divides into
n. infraorbitalis
n. pterygopalatinus
n. zygomaticus