WKI Sales Training Feb 2014

Overview of the Central and Peripheral Nervous Systems 45

II

Optic chiasma

Interpeduncular fossa Crura cerebri Mammillary body

Midbrain

III

IV

Posterior perforated substance

V

Pons

Middle cerebellar peduncle

VI

VII VIII

Olive

Medulla

IX

X

XI

XI

(a)

Pons

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.

Middle cerebellar peduncle

Pyramid

Inferior cerebellar peduncle

Olive

Cerebellum

(b)

Midbrain

Pons

Trigeminal nerve

Middle cerebellar peduncle

Cerebellum

Olive

Inferior cerebellar peduncle Medulla

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.

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8/27/2012 2:06:25 PM