Lumbar Plexus Flashcards
The lumbar plexus is ocated in the ______ region, within the substance of the _____ muscle and anterior to the ______ of the ____ vertebrae.
lumbar
psoas major
transverse processes; lumbar
The plexus is formed by the anterior rami (divisions) of the lumbar spinal nerves ___,__,__,___
It also receives contributions from thoracic spinal nerve ___.
L1, L2, L3 and L4.
12
The ______ nerve is the first major branch of the lumbar plexus.
iliohypogastric
iliohypogastric nerve
It runs to the _____ , across the ______ muscle of the posterior abdominal wall. It then perforates the _______ , and divides into its terminal branches.
iliac crest
quadratus lumborum
transversus abdominis
iliohypogastric nerve
Roots: ________
Motor Functions: Innervates the ______ and _______
L1 (with contributions from T12).
internal oblique and transversus abdominis.
Iliohypogastric nerve
Sensory Functions: Innervates the anteromedial gluteal skin in the pubic region.
T/F
F
Posterolateral*
The ilioinguinal nerve follows the same anatomical course as the (smaller or larger?) iliohypogastric nerve.
T/F
Larger
T
Ilioinguinal Nerve
After innervating the muscles of the anterior abdominal wall, it passes through the _________ to innervate the skin of the ____ and _____ thigh.
superficial inguinal ring
genitalia
middle
Ilioinguinal Nerve
Roots: ____
Motor Functions: Innervates the ______ and ____
Sensory Functions: Innervates the skin on the (superior or inferior?) antero-medial thigh.
In males, it also supplies the skin over the ___ of the penis and (anterior or posterior?) scrotum.
In females, it supplies the skin over ______ and _____
L1.
internal oblique and transversus abdominis.
Superior
root
Anterior
mons pubis and labia majora.
Genitofemoral Nerve
After leaving the psoas major muscle, the genitofemoral nerve quickly divides into a ____ branch, and a _____ branch.
genital
Femoral
Genitofemoral Nerve
Roots: _____
Motor Functions: The genital branch innervates the _____ muscle.
Sensory Functions: The genital branch innervates the skin of the _____ (in males) or the skin over ____ and ____ (in females).
The femoral branch innervates the skin on the (upper or lower ?) (anterior or posterior?) thigh.
L1, L2.
cremasteric
anterior scrotum ; mons pubis and labia majora
Upper
Anterior
Lateral Cutaneous Nerve of the Thigh
It enters the thigh at the (medial or lateral?) aspect of the inguinal ligament, where it provides cutaneous innervation to the skin there.
Roots: ___,___
Lateral
L2, L3
Lateral Cutaneous Nerve of the Thigh
This nerve has a sensorimotor function
T/F
F
purely sensory
Lateral Cutaneous Nerve of the Thigh
Motor Functions: _____ .
Sensory Functions: Innervates the (anterior or posterior ?) and (medial or lateral?) thigh down to the level of the ______.
None
Anterior
Lateral
knee
Obturator Nerve
Roots:_____
Motor Functions: Innervates the muscles of the (medial or lateral?) thigh – LIST THEM
Sensory Functions: Innervates the skin over the (medial or lateral?) thigh.
L2, L3, L4.
Medial
the obturator externus, adductor longus, adductor brevis, adductor magnus and gracilis.
Medial
