90) Explanation





The formation of primary plate is due to fusion of maxillary
and medial nasal processes. Defective formation leads to
cleft lip.
• The formation of secondary plate is due to fusion of
lateral palatine process, nasal septum and median palatine
process. Defective formation leads to cleft palate.

Correct Answer - D
Ans. D. Subcardinal sinus
The inferior vena cava is composed of (from caudal to cranial):
1. Posterior intercardinal anastomosis.
2. The caudal portion of the right supracardinal vein.
3. The right anastomosis between the supracardinal and the
subcardinal veins.
4. A segment of the right subcardinal vein.
5. The anastomosis between the right subcardinal and right vitelline
veins.
6. The terminal portion of the right vitelline vein.

Correct Answer - D
Ans: D. Motor speech
Motor speech defect is also called apraxia of speech.
Injury to the Broca’s area/left inferior frontal gyrus causes motor
speech defect.
BDC 7th edition, volume 4, page no 129.

Correct Answer - B
Ans: B. 4th arch
Left RLN winds around the arch of aorta
Arch of aorta is derived from the 4th arch
Langmans Medical Embryology 13th edition (Page no 88,239)

Correct Answer - B
Ans. is 'b' i.e., Cavernous sinus [Ref Textbook of neuroanatomy
p. 189]
Superficial middle cerebral vein
It runs along the posterior ramus and stem of lateral sulcus.
It drains blood from superolateral surface of the cerebral hemisphere
into the cavernous sinus.
It communicates with the superior sagittal and transverse sinus
through vein of Trolard and vein of Labbe respectively.

Correct Answer - B

Ans. is 'b' i.e. Square of Lumbar [Ref BDC 6th le Vol. 2 p. 343; Snell 9" le p. 695]

Quadratus lomborum is enclosed between anterior and middle layers. Erector spinae (paraspinal muscle) is enclosed between middle and posterior layer.

Correct Answer - A
Ans, A. Arch of aorta
2d constriction is at T4 level where arch of aorta crosses esophagus

Correct Answer - B
Ans. is 'b' i.e., Central part of lower lip [Ref BDC Vol. III 6
th
/e p.
73] Lymphatic drainage of face
The face possesses three areas from which lymphatic drainage
is as follows:?
1. Upper area, comparising greater part of forehead, lateral Vi of
eyelids, conjunctiva, lateral part of cheek and parotid area, drains
into preauricular (superficial) parotid nodes.
2. Middle area, comprising central part of forehead, external nose,
upper lip, lateral part of lower lip, medial halves of eyelids, medial
part of cheek, and greater part of lower jaw, drains into
submandibular nodes.
3. Lower area, including central part of lower lip and the chin, drains
into submental nodes.

Correct Answer - B
Ans. is 'b' i.e., Cribriform plate of ethmoid
The olfactory mucosa lines the upper one-third of nasal cavity
including the roof formed by cribriform plate and the medial and
lateral walls up to the level of superior concha (turbinate).