MuscleTables
5
MuscleTables
Table5-2
MUSCLE
PROXIMAL
ATTACHMENT
(ORIGIN)
DISTAL
ATTACHMENT
(INSERTION)
INNERVATION
MAIN ACTIONS
BLOOD SUPPLY
MUSCLE
GROUP
Piriformis
Anterior surface of
sacral segments
2–4,
sacrotuberous
ligament
Superior border of
greater
trochanter of
femur
Ventral rami of L5,
S1, S2
Laterally rotates
extended thigh,
abducts flexed
thigh at hip
Superior and inferior
gluteal arteries,
internal
pudendal artery
Gluteal region
Puborectalis
Lower part of pubic
symphysis,
superior fascia
of urogenital
diaphragm
Loops around
rectum; no distal
attachment
Nerve to levator ani
muscle
Pelvic floor
Sphincter urethrae
External fibers from
junction of
inferior pubic
and ischial rami
and adjacent
fascia; internal
fibers pass
medially to
surround
membranous
urethra
Male:
median raphe
in front and
behind urethra
Female:
encloses
urethra, attaches
to sides of
vagina
Perineal branches of
pudendal nerve
Compresses urethra
at end of
micturition; in
female also
compresses the
distal vagina
Perineal branch of
internal
pudendal artery
Perineal
Sphincter
urethrovaginalis
(female only)
Perineal body
Passes forward and
anterior around
urethra
Perineal branches of
pudendal nerve
Sphincter of urethra
and vagina
Perineal branch of
pudendal artery
Perineal
Superficial transverse
perineal
Ischial rami and
tuberosities
Central tendon
(perineal body)
Perineal branches of
pudendal nerve
Stabilizes central
tendon
Perineal branch of
internal
pudendal artery
Perineal
