Brainstem Anatomy (gross and general)

midbrain

1-6

pons

yellow

medulla

17

pyramids

11-18

cerebral peduncles

4

optic tract

2

optic chiasm

between 1 and 2

optic nerve

1

midbrain

A-E

pons

F-G

medulla

H-K

superior colliculus

B

inferior colliculus

C

superior cerebellar peduncles

SUPERIOR CEREBELLAR PEDUNCLES

middle cerebellar peduncles

MIDDLE CEREBELLAR PEDUNCLES

inferior cerebellar peduncles

G

caudal medulla

rostral medulla

caudal pons

rostral pons

caudal midbrain

rostral midbrain

STT (spinothalamic tract)

8

medial lemniscus

6

pyramids

under 6

STT (spinothalamic tract)

7, 11

medial lemniscus

10

pyramids

9

inferior olivary nucleus

8

4th ventricle

above 14

STT (spinothalamic tract)

2

medial lemniscus

1

CST (corticospinal tract)

3

4th ventricle

4TH VENTRICLE

deep cerebellar nuclei

white spots above 4th ventricle

cerebellar peduncles

2, 3, 4

STT (spinothalamic tract)

12, 13

medial lemniscus

9

CST

7

4th ventricle

16

superior cerebellar peduncles

14

STT (spinothalamic tract)

dark vertical line under 8

medial lemniscus

dark horizontal line under 8

cerebral aqueduct

yellow line

cerebral peduncles

5

periaqueductal gray

lighter area around hole

inferior colliculus

1

STT (spinothalamic tract)

forward slash dark line under 4

medial lemniscus

back slash dark line under 4

cerebral aqueduct

4

cerebral peduncles

3

periaqueductal gray

5

superior colliculus

1