Overview of the Central and Peripheral Nervous Systems 45
Middle cerebellar
peduncle
IX
XI
Olive
VI
Posterior perforated
substance
IV
Interpeduncular
fossa
Crura cerebri
Optic chiasma
Mammillary body
X
XI
V
VII
VIII
III
II
Pons
Midbrain
(a)
Medulla
(b)
Pyramid
Olive
Cerebellum
Pons
Middle cerebellar
peduncle
Inferior cerebellar
peduncle
Figure 6.3
Ventral view of brainstem and hind-
brain. (a) Ventral aspect of the midbrain, pons and
medulla (brainstem). Note the attachment of cranial
nerves III to XII to the brainstem. The optic nerve (II) is
not attached to the brainstem but forms optic chiasma
near the upper part of midbrain. (b) Ventral aspect of
the lower part of pons, medulla and cerebellum (hind-
brain). Note the pyramid, olive, inferior cerebellar pe-
duncles and middle cerebellar peduncles.
Photograph courtesy:
Professor SD Joshi, Dean, SAIMS,
Indore, Madhya Pradesh.
Figure 6.4
Parts of hindbrain: Pons, medulla and cerebellum. In this figure, the attachments of only trigeminal nerve is shown. Though midbrain is
also shown in this diagram but it is not a part of hindbrain.
Trigeminal
nerve
Pons
Olive
Inferior cerebellar
peduncle
Medulla
Cerebellum
Midbrain
Middle
cerebellar peduncle
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