ANAT-321 DEMONSTRATOR LAB1
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Transcript of ANAT-321 DEMONSTRATOR LAB1
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