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Discussion Starter · #1 ·
Which of the following statements correctly pertains to the dartos tunic of the scrotum?
A. It is formed by the fusion of the two layers of superficial fascia of the perineum
B. It is invested with adipose tissue
C. It participates in the cremaster reflex
D. It receives innervation from the genital branch of the genitofemoral nerve
E. It responds to cold temperatures by lowering the testes away from the body
 

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A. It is formed by the fusion of the two layers of superficial fascia of the perineum
 

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D. It receives innervation from the genital branch of the genitofemoral nerve
 

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Discussion Starter · #6 ·
The answer is A
The two layers of superficial perineal fascia, i.e., the superficial layer of subcutaneous fascia (Cruveilhier's) and the deep layer of subcutaneous fascia (Colles'), fuse to form thedartos tunic of the scrotum. However, the superficial layer loses its fat and picks upsmooth muscle. The smooth muscle of the dartos is responsive to temperature. The dartos muscle relaxes when too warm, which drops the testes away from the body, and contracts when too cool, which brings the testes closer to the body. This provides a thermoregulatory mechanism that helps maintain the optimum temperature for spermatogenesis. The cremaster reflex is associated with the spermatic cord and raises the testes within the scrotum as a protective measure. The afferent limb and efferent limbs of the cremaster reflex are provided, respectively, by the femoral and genital branches of the genitofemoral nerve.
 

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**** man!! seems i need to revise anatomy back again:mad:
 
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