ANAT 321

REVIEW

LABORATORY 1

NEUROANATOMY LAB

BRAINSTEM VENTRAL VIEW MIDBRAIN

medulla

pons

midbrain

BRAINSTEM VENTRAL VIEW MIDBRAIN

medulla

pons

midbrain

Cerebral peduncleCN 3

CN 5CN 6

Pyramid

CN 9

CN 8CN 7

CN 10

Inferior olive

REVIEW: LAB 1

• Question– What structure lies lateral to the

pyramids?

• Answer– The inferior olive

REVIEW: LAB 1

• Question– What cranial nerve exits ventrally

between the cerebral peduncles?

• Answer– Cranial nerve 3

BRAINSTEM DORSAL VIEW w/ out cerebellum

BRAINSTEM DORSAL VIEW w/ out cerebellum

Superior colliculus

Middle cerebellar peduncle

Inferior cerebellar peduncle

Nucleus gracilis

Nucleus cuneatus

4th ventricle

inferior colliculus

REVIEW: LAB 1

• Question– Which cranial nerve lies between the

pyramids and the inferior olives?

• Answer– CN 12

REVIEW: LAB 1

• Question– What is the relationship between the

cerebral peduncles and the pyramids?

• Answer– The pyramids comprise the corticospinal

fibres which are a white matter fibre pathway originating in the motor cortices. The fibres course through the internal capsule and then funnel down into the cerebral peduncles and then through the medulla.

REVIEW: LAB 1

• Question – Why are the cerebral peduncles

larger than the pyramids?

• Answer– There are more fibre tracts in

the cerebral peduncles

REVIEW: LAB1

• Be sure that you understand the structure of the ventricular system in the medulla, pons, & midbrain

• Answer– Ventricles are spaces in

the brain filled with cerebral spinal fluid (CSF)

REVIEW: LAB 1

– Ventricles are spaces in the brain filled with cerebral spinal fluid (CSF)

anteriorposterior

REVIEW: LAB 1

• There are two lateral ventricles found in both cerebral hemispheres

Lateral ventricles

REVIEW: LAB 1

• The walls of the third ventricle are formed by the thalamus

REVIEW: LAB 1

• CSF flows from the third ventricle through the midbrain to the fourth ventricle by the cerebral aqueduct

REVIEW: LAB 1

• The fourth ventricle is located dorsal to the pons and medulla

REVIEW: LAB 1

• Be sure that you understand the relationship of the cerebellum to the 4th ventricle and to the medulla and pons.

• Answer– The cerebellum forms the

roof of the 4th ventricle

REVIEW: LAB 1

• Be sure that you understand the relationship of the cerebellum to the 4th ventricle and to the medulla and pons.

• Answer– The cerebellum is attached to the

pons through the middle cerebellar peduncles and the medulla by the inferior cerebellar peduncles

QUIZ

A

B

C

D

Answer Key

– A: cerebral peduncle– B: CN5– C:CN6– D: pyramid

A

B

C

D

E

Answer Key

– A: superior colliculus– B: inferior colliculus– C: middle cerebellar peduncle– D: nucleus gracilis– E: fourth ventricle

A

B

C

D

E

Answer Key

– A: pons– B: CN8– C: CN12– D: inferior olive– E: CN7