Lecture Notes - Brain, Cranial Nerves, and Cranial Cavity

Skull:

Calvaria (cranial vault): emissary foramina
Skull base: anterior, middle and posterior cranial fossae: fractures

Cranial Nerves:

Number	Name	Foramen	Function
I	Olfactory	cribriform plate of ethmoid	smell
II	Optic	optic canal	vision
III	Oculomotor	superior orbital fissure	eye muscles
IV	Trochlear	superior orbital fissure	eye muscles
V	Trigeminal	(1) Ophthalmic: superior orbital fissure; (2) Maxillary: foramen rotundum; (3) mandibular: foramen ovale	face sensation & mastication
VI	Abducent	superior orbital fissure	eye muscles
VII	Facial	internal acoustic meatus	face muscles; salivary & lacrimal glands
VIII	Vestibulocochlear	internal acoustic meatus	hearing & balance
IX	Glossopharyngeal	jugular canal (foramen)	pharynx; tongue & parotid gland
X	Vagus	jugular canal	pharynx, larynx & viscera
XI	Accessory	jugular canal	neck muscles (Trapezius/sternocleidomastoid)
XII	Hypoglossal	hypoglossal canal	tongue muscles

Brain:

Subdivisions:
Cerebrum: 2 cerebral hemispheres; lobes: frontal, parietal, occipital, temporal, and insular
Brainstem: last 10 cranial nerves attached to it; midbrain (III, IV), pons (V, VI, VII, VIII), and medulla oblongata (IX, X, XI, XII)
Cerebellum: 2 cerebellar hemispheres

Ventricles & CSF:

2 Lateral ventricles: in cerebral hemispheres
Third ventricle: in diencephalon
Cerebral aqueduct: in midbrain
Fourth ventricle: in brain stem
Subarachnoid space: CSF: 100-120 ml