Accessory obturator nerve
Encyclopedia
In human anatomy
, the accessory obturator nerve is an accessory
nerve
in the lumbar
region present in about 29% of cases.
It is of small size, and arises from the ventral divisions of the third and fourth lumbar nerves
. Recent evidence support that this muscle arises from Dorsal divisions.
It descends along the medial border of the psoas major, crosses the superior ramus
of the pubis
, and passes under the pectineus, where it divides into numerous branches.
One of these supplies the pectineus, penetrating its deep surface, another is distributed to the hip-joint; while a third communicates with the anterior branch of the obturator nerve
.
Occasionally the accessory obturator nerve is very small and is lost in the capsule of the hip-joint.
When it is absent, the hip-joint receives two branches from the obturator nerve.
Human anatomy
Human anatomy is primarily the scientific study of the morphology of the human body. Anatomy is subdivided into gross anatomy and microscopic anatomy. Gross anatomy is the study of anatomical structures that can be seen by the naked eye...
, the accessory obturator nerve is an accessory
Accessory
Accessory may refer to:* Accessory , a person who assists a criminal but is not present at the crime* Accessory , with members Dirk Steyer and Ivo Lottig* Fashion accessory, i.e...
nerve
Nerve
A peripheral nerve, or simply nerve, is an enclosed, cable-like bundle of peripheral axons . A nerve provides a common pathway for the electrochemical nerve impulses that are transmitted along each of the axons. Nerves are found only in the peripheral nervous system...
in the lumbar
Lumbar
In tetrapod anatomy, lumbar is an adjective that means of or pertaining to the abdominal segment of the torso, between the diaphragm and the sacrum ...
region present in about 29% of cases.
It is of small size, and arises from the ventral divisions of the third and fourth lumbar nerves
Lumbar nerves
The lumbar nerves are the five spinal nerves emerging from the lumbar vertebrae. They are divided into posterior and anterior divisions.-Posterior divisions:...
. Recent evidence support that this muscle arises from Dorsal divisions.
It descends along the medial border of the psoas major, crosses the superior ramus
Superior pubic ramus
The superior pubic ramus is a part of the pubic bone which forms a portion of the obturator foramen.It extends from the body to the median plane where it articulates with its fellow of the opposite side...
of the pubis
Pubis (bone)
In vertebrates, the pubic bone is the ventral and anterior of the three principal bones composing either half of the pelvis.It is covered by a layer of fat, which is covered by the mons pubis....
, and passes under the pectineus, where it divides into numerous branches.
One of these supplies the pectineus, penetrating its deep surface, another is distributed to the hip-joint; while a third communicates with the anterior branch of the obturator nerve
Obturator nerve
The obturator nerve in human anatomy arises from the ventral divisions of the second, third, and fourth lumbar nerves; the branch from the third is the largest, while that from the second is often very small.-Path:...
.
Occasionally the accessory obturator nerve is very small and is lost in the capsule of the hip-joint.
When it is absent, the hip-joint receives two branches from the obturator nerve.