Pituitary Gland

 

PITUITARY GLAND

Q. 1

Anterior pituitary develops from?

 A Infundinulum
 B Neuroectoderm
 C Rathke’s pouch
 D None

Q. 1

Anterior pituitary develops from?

 A Infundinulum
 B Neuroectoderm
 C Rathke’s pouch
 D None
Ans.C

Explanation:

Rathke’s pouch

Anterior lobe (adenohypophysis) of pituitary develops from Rathke’s pouch (ectodermal diverticulum of the primitive oral cavity).


Q. 2

Herring bodies are seen in:

 A Pars tuberalis
 B Pars intermedia
 C Neurohypophysis
 D Pars terminalis

Q. 2

Herring bodies are seen in:

 A Pars tuberalis
 B Pars intermedia
 C Neurohypophysis
 D Pars terminalis
Ans.C

Explanation:

Neurohypophysis

  • Herringbodies are neurosecretory structures present in the neurohypophysis (posterior pituitary).
  • They represent the terminal end of the axon from the hypothalamus for temporary storage of hormones.

Q. 3

All are derivatives of Rathke’s pouch EXCEPT?

 A Pars intermedia
 B Pars tuberalis
 C Neurohypophysis
 D Pars distalis

Q. 3

All are derivatives of Rathke’s pouch EXCEPT?

 A Pars intermedia
 B Pars tuberalis
 C Neurohypophysis
 D Pars distalis
Ans.C

Explanation:

Neurohypophysis

  • Neurohypophysis (posterior lobe) develops from a aventral evagination of the hypothalamus (diencephalon).
  • It includes the median eminence, infundibular stem, & pars nervosa.
  • Rathke’s pouch gives rise to the various components of the anterior pituitary incliding pars anterior, pars tuberalos, pars intermedia.

Q. 4

Venous drainage from neurohypophysis is routed through all of the following EXCEPT?

 A Portal vessels to adenohypophysis
 B Superior hypophyseal veins to ventricular tanycytes
 C Inferior hypophyseal veins to dural venous sinuses
 D Capillaries to median eminence & hypothalamus

Q. 4

Venous drainage from neurohypophysis is routed through all of the following EXCEPT?

 A Portal vessels to adenohypophysis
 B Superior hypophyseal veins to ventricular tanycytes
 C Inferior hypophyseal veins to dural venous sinuses
 D Capillaries to median eminence & hypothalamus
Ans.B

Explanation:

Superior hypophyseal veins to ventricular tanycytes

  • There are no vessels by the name superior hypophyseal veins
  • There are 3 routes for venous drainage of neurohypophysis: To adenohypophysis via long & short portal vessels; into dural venous sinuses via inferior hypophyseal veins & to hypothalamus via capillaries passing to median eminence.


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