Question:
Adenohypophysis develops from
(A) Endoderm of dorsal pharyngeal roof
(B) Ecoterm of dorsal pharyngeal roof
(C) Mesoderm of dorsal pharyngeal roof
(D) Ectoderm of hypothalamus
Adenohypophysis develops from
(A) Endoderm of dorsal pharyngeal roof
(B) Ecoterm of dorsal pharyngeal roof
(C) Mesoderm of dorsal pharyngeal roof
(D) Ectoderm of hypothalamus
(A) Endoderm of dorsal pharyngeal roof
(B) Ecoterm of dorsal pharyngeal roof
(C) Mesoderm of dorsal pharyngeal roof
(D) Ectoderm of hypothalamus
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To remember the origins of the pituitary gland:
- Anterior (Adenohypophysis) $\rightarrow$ Upward pouch from the oral ectoderm (Rathke's pouch).
- Posterior (Neurohypophysis) $\rightarrow$ Downward bud from the brain ectoderm (hypothalamus).
- Anterior (Adenohypophysis) $\rightarrow$ Upward pouch from the oral ectoderm (Rathke's pouch).
- Posterior (Neurohypophysis) $\rightarrow$ Downward bud from the brain ectoderm (hypothalamus).
Updated On: Aug 3, 2026
- Endoderm of dorsal pharyngeal roof
- Ectoderm of dorsal pharyngeal roof
- Mesoderm of dorsal pharyngeal roof
- Ectoderm of hypothalamus
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
The pituitary gland (hypophysis) has a dual embryological origin, reflecting its division into the adenohypophysis (anterior lobe) and neurohypophysis (posterior lobe).
This dual origin allows the gland to coordinate both nervous and endocrine signaling.
Step 2: Detailed Explanation:
Let us trace the embryological development of both parts of the pituitary gland:
- Adenohypophysis (Anterior Pituitary): This structure develops from an upward finger-like ectodermal evagination of the primitive oral cavity (stomodeum).
This invagination is known as Rathke's pouch or the hypophyseal diverticulum.
Since the stomodeum is lined by ectoderm, Rathke's pouch arises specifically from the ectoderm of the dorsal pharyngeal roof. Thus, option (B) is correct.
- Neurohypophysis (Posterior Pituitary): This structure develops from a downward neuroectodermal projection of the diencephalon floor (hypothalamus), called the infundibulum.
The direct connection between these two tissue layers allows the mature pituitary gland to link the central nervous system with systemic endocrine regulation.
Step 3: Final Answer:
The adenohypophysis develops from the ectoderm of the dorsal pharyngeal roof. This corresponds to option (B).
The pituitary gland (hypophysis) has a dual embryological origin, reflecting its division into the adenohypophysis (anterior lobe) and neurohypophysis (posterior lobe).
This dual origin allows the gland to coordinate both nervous and endocrine signaling.
Step 2: Detailed Explanation:
Let us trace the embryological development of both parts of the pituitary gland:
- Adenohypophysis (Anterior Pituitary): This structure develops from an upward finger-like ectodermal evagination of the primitive oral cavity (stomodeum).
This invagination is known as Rathke's pouch or the hypophyseal diverticulum.
Since the stomodeum is lined by ectoderm, Rathke's pouch arises specifically from the ectoderm of the dorsal pharyngeal roof. Thus, option (B) is correct.
- Neurohypophysis (Posterior Pituitary): This structure develops from a downward neuroectodermal projection of the diencephalon floor (hypothalamus), called the infundibulum.
The direct connection between these two tissue layers allows the mature pituitary gland to link the central nervous system with systemic endocrine regulation.
Step 3: Final Answer:
The adenohypophysis develops from the ectoderm of the dorsal pharyngeal roof. This corresponds to option (B).
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