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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2016/08/29 07:01:06」(JST)

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The genitofemoral nerve refers to a human nerve that is found in the abdomen. Its branches, the genital branch and femoral branch supply sensation to the upper anterior thigh, as well as the skin of the anterior scrotum in males and mons pubis in females. The femoral branch is different from the femoral nerve, which also arises from the lumbar plexus.

Anatomy

The genitofemoral nerve originates from the upper L1-2 segments of the lumbar plexus. It passes downwards, pierces psoas major and emerges from its anterior surface . The nerve divides into two branches, the genital branch and the lumboinguinal nerve also known as the femoral branch,^[1] both of which then continue downwards and medially to the inguinal and femoral canal respectively.

Genital Branch

The genital branch passes through the deep inguinal ring and enters the inguinal canal. In men, the genital branch supplies the cremaster and scrotal skin. In women, the genital branch accompanies the round ligament of uterus, terminating in and innervating the skin of the mons pubis and labia majora.^[1]

Femoral Branch

The femoral branch passes underneath the inguinal ligament, travelling through the lateral muscular compartment of the femoral canal where it communicates with the femoral nerve. Passing through the cribriform fascia of the saphenous opening of the fascia lata of the thigh, it then supplies the skin of the upper, anterior thigh.^[1]

Variation

Embryology

Function

The genitofemoral nerve is responsible for both the sensory (femoral branch) and motor portions (genital branch) of the cremasteric reflex, which describes contraction of the cremasteric muscle when the skin of the superior medial part of the thigh is touched.^[1] ^:262

Additional images

Deep and superficial dissection of the lumbar plexus.
Genitofemoral nerve
Genitofemoral nerve

External links

Anatomy photo:36:07-0305 at the SUNY Downstate Medical Center - "Inguinal Region, Scrotum and Testes: Layers of the spermatic cord"
Anatomy figure: 40:07-13 at Human Anatomy Online, SUNY Downstate Medical Center - "Muscles and nerves of the posterior abdominal wall."
posteriorabdomen at The Anatomy Lesson by Wesley Norman (Georgetown University) (posteriorabdmus&nerves)

References

^ ^a ^b ^c ^d Drake, Richard L.; Vogl, Wayne; Tibbitts, Adam W.M. Mitchell; illustrations by Richard; Richardson, Paul (2005). Gray's anatomy for students (Pbk. ed.). Philadelphia: Elsevier/Churchill Livingstone. pp. 340–343. ISBN 978-0-443-06612-2.

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「陰部大腿神経」

Genitofemoral nerve
	Plan of lumbar plexus. (Genitofemoral nerve visible at upper left.)
	The lumbar plexus and its branches. (Genitofemoral nerve visible at upper left.)
Details
From	lumbar plexus
To	lumboinguinal, genital branch
Innervates	cremaster
Identifiers
Latin	Nervus genitofemoralis; Nervus genitalifemoralis
Dorlands; /Elsevier	n_05/12565836
TA	A14.2.07.008
FMA	16484
	Anatomical terms of neuroanatomy [edit on Wikidata]

　　[★]

英: genitofemoral nerve (N)
ラ: nervus genitofemoralis
関: 腰神経叢

図：KL.208 KA.333

由来

腰神経叢
T12,L1,L2 (KL.208)
L1,L2 (N.480)

支配

陰嚢、大陰唇
大腿上部内側の皮膚

走行

大腰筋の貫いてその表面に出て、大腰筋に沿って下行 (M.181)
外腸骨動脈の外側で分岐 (M.181)
- 1本は精索(子宮円索)に沿って陰嚢(大陰唇)に分布 (KL.208)
- 1本は、外腸骨動脈に沿って下行し、鼡径靭帯の下を通り、伏在裂孔からでて(150%){大腿上部の内側部の皮膚に分布}; (KL.208)
腸骨鼡径神経と共に陰部に分布するが、N.249によれば、比較的上部or内側に分布している、らしい。
大腰筋の中で2つに分岐 (KL.208) ← ???

枝

「nervus」

　　[★]

神経

関: nerve、nervi、nervous、neural、neuro、neuron

[GRAYS2005-1] Drake, Richard L.; Vogl, Wayne; Tibbitts, Adam W.M. Mitchell; illustrations by Richard; Richardson, Paul (2005). Gray's anatomy for students (Pbk. ed.). Philadelphia: Elsevier/Churchill Livingstone. pp. 340–343. ISBN 978-0-443-06612-2.

匿名

検索

案内

案内

nervus genitofemoralis