Brain and Cranial Nerves

Unit 4 Lab 14

Located in the Frontal Lobe

Pre-Central gyrus and Primary somatomotor cortex

Function of Pre-central gyrus and primary somatomotor cortex

Controls all voluntary skeletal muscle movement

Located in the Parietal lobe

Post-central gyrus and primary somatosensory cortex

Function of Post-central gyrus and primary somatosensory cortex

Recieves all somatic sensory information

Function of Occipital lobe

Vision

Function of Temporal lobe

Hearing and olfaction

Function of Insula

Taste and visceral sensory perception

Function of Olfactory nerve (CNI)

Olfaction (smell)

What does the Olfactory nerve (CN I) pass through

Cribriform foramina

Contained in Olfactory bulb

Fibers of olfactory nerve (CN I)

Function of Optic nerve (CN II)

Vision

What does the Optic nerve (CN II) pass through?

The optic canal

Function of Optic chiasm(a)

Some fibers of the optic nerve (CN II) contralaterally cross here

Function of Infundibulum

Connects the hypothalamus to the pituitary gland

Function of the Mamillary bodies

Regulates emotions; part of the limbic system

Function of Cerebral peduncles

Carries motor information from the cerebral hemispheres to the brain stem and spinal cord

Function of Oculomotor nerve (CN III)

Motor to four extrinsic eye muscles and carries parasympathetic innervation to the iris

What does the Oculomotor nerve (CN III) pass through?

The superior orbital fissure

Function of Middle cerebellar peduncles

Connects the pons and the cerebellum

Function of Trigeminal Nerve (CN V)

Sensory from the face; motor to muscles of mastication

What does the Trigeminal nerve (CN V) pass through?

Superior orbital fissure, foramen rotundum, foramen ovale

Function of Abducens nerve (CN VI)

Motor to lateral rectus eye muscle

What does the Abducens nerve (CN VI) pass through

Superior orbital fissure

Function of Pyramids

Motor information from the cerebral hemispheres to the brain stem and spinal cord

Function of the Decussation of the pyramids

Motor tracts cross contralaterally

Contained in subarachnoid space

Cerebrospinal fluid (CSF)

Function of Arachnoid villi

Transfers waste from the subarachnoid space to Dural venous sinuses (such as the superior sagittal sinus)

Contained in Superior sagittal sinus

Venous blood

Function of Cingulate gyrus

Regulates emotions; part of the limbic system

Function of Corpus callosum

Contralateral connection between the right and left cerebral hemispheres

Function of Thalamus

All incoming sensory information is relayed to the thalamus first (Except for olfaction); filters sensory information going to cortex

Function of Interthalamic adhesion (Intermediate mass)

Connects the right and left thalami

Function of Pineal gland

Secretes a hormone called melatonin which functions in day/night cycle

Function of Superior colliculus

Visual reflexes

Function of Inferior colliculi

Auditory reflexes

Contained in the Ventricles

Cerebrospinal fluid (CSF)

Function of Septum pellucidum

Seperates two lateral ventricles

Function of Interventricular foramen

Allows CSF to flow from the lateral ventricles into the third ventricle

Function of Choroid plexus

Produces Cerebrospinal fluid (CSF)