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.
