The Cremaster Muscle Can Raise and Lower the Testes to Regulate
Template:Infobox Muscle
Overview
The cremaster muscle is a muscle that covers the testis.
Contraction
Its function is to raise and lower the scrotum in club to regulate the temperature of the testis and promote spermatogenesis.
In a absurd surroundings the cremaster draws the testis closer to the torso preventing heat loss, while when information technology is warmer the cremaster relaxes assuasive the testis to absurd.
Clinically, a reflex arc can be demonstrated by lightly stroking the skin of the inner thigh down from the hip towards the knee. This causes the cremaster muscle on the same side to apace contract, raising that testicle. This so called cremasteric reflex is much more pronounced in boys than in men.
The cremaster can likewise exist contracted voluntarily, by contracting the PC muscle (using Kegels), or by sucking in the belly. Not all males are capable of doing this, equally information technology requires pelvic muscle strength.
Evolution and gender differences
The cremaster develops to its full extent just in males; in females it is represented by only a few musculus loops.
In human being females, the cremaster musculus is smaller and is found on the round ligament.
In rats, it has been shown that cremaster muscles adult from the gubernacular seedling.
Construction
In human males, the cremaster muscle is a thin layer of skeletal muscle establish in the inguinal canal and scrotum between the external and internal layers of spermatic fascia, surrounding the testis and spermatic string. The cremaster muscle is a paired structure, there existence one on each side of the body.
Anatomically, the lateral cremaster muscle originates from the internal oblique musculus, but superior to the inguinal canal, and the eye of the inguinal ligament. The medial cremaster muscle, which sometimes is absent, originates from the pubic tubercle and sometimes the lateral pubic crest. Both insert into the tunica vaginalis underneath the testis.
Innervation and vascular supply
The cremaster muscle is innervated from the genital co-operative of the genitofemoral nervus and supplied by the cremasteric avenue.
It receives distinctly dissimilar innervation and vascular supply in comparison to the internal oblique.
Pop civilization
Matthew Barney's film sequence The Cremaster Bike used the cremaster muscle as its conceptual betoken of departure.
Etymology
The give-and-take is derived from the Greek verb κρεμάννυμι = "I hang (transitive)", non from Latin cremare.
Additional images
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The scrotum.
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The right testis, exposed by laying open the tunica vaginalis.
External links
- Template:GPNotebook
- Template:MuscleLoyola
- Template:SUNYAnatomyLabs - "Inguinal Region, Scrotum and Testes: Layers of the Spermatic Cord"
- Template:EMedicineDictionary
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de:Musculus cremaster it:Muscolo cremastere nl:Muscle cremaster Template:Jb1 Template:WH Template:WS
Source: https://www.wikidoc.org/index.php/Cremaster_muscle
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