Download Pelvis Muscle Table - Stritch School of Medicine

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Transcript
Robert Frysztak, PhD.
Structure of the Human Body
Loyola University Chicago
Stritch School of Medicine
PELVIS MUSCLE TABLE
MUSCLE
PROXIMAL ATTACHMENT (ORIGIN)
DISTAL ATTACHMENT (INSERTION)
INNERVATION
Iliacus
Superior 2/3 of iliac fossa, ala of Lesser trochanter of femur and shaft Femoral nerve
sacrum, anterior sacro‐iliac ligaments inferior to it, to psoas major tendon
Obturator internus
Pelvic surface of obturator membrane and surrounding bone
Piriformis
MAIN ACTIONS
BLOOD SUPPLY
MUSCLE GROUP
Flexes thigh at hips and stabilizes hip Iliac branches of iliolumbar artery
joint, acts with psoas major
Anterior thigh
Medial surface of greater trochanter Nerve to obturator internus
of femur
Laterally rotates extended thigh, abducts flexed thigh at hip
Internal pudendal and obturator arteries
Gluteal region
Anterior surface of sacral segments 2–4, sacrotuberous ligament
Superior border of greater trochanter Ventral rami of L5, S1, S2
of femur
Laterally rotates extended thigh, abducts flexed thigh at hip
Superior and inferior gluteal arteries, Gluteal region
internal pudendal artery
Coccygeus (ischiococcygeus)
Ischial spine, sacrospinous ligament
Inferior sacrum, coccyx
Supports pelvic viscera, draws coccyx Inferior gluteal artery
forward
Levator ani
Body of pubis, tendinous arch of obturator fascia, ischial spine
Inferior gluteal artery, internal Perineal body, coccyx, anococcygeal Ventral rami of lower sacral nerves, Supports pelvic viscera, raises pelvic pudendal artery and its branches Pelvic floor
raphe, walls of prostate or vagina, perineal nerve
floor
rectum, anal canal
(inferior rectal and perineal arteries)
Puborectalis
Lower part of pubic symphysis, superior fascia of urogenital diaphragm
Loops around rectum; no distal attachment
Ventral rami of lower sacral nerves
Nerve to levator ani muscle
 
 
Bulbospongiosus
Male: perineal membrane, corpus Male: median raphe, bulb of penis, cavernosum, bulb of penis Female: perineal body dorsum of clitoris, inferior fascia of Female : perineal body
urogenital diaphragm, bulb of vestibule, pubic arch
Male: compresses bulb of penis, forces blood into body of penis during erection, removes urine from Deep branch of perineal nerve from urethra and semen during ejaculation Internal pudendal artery and its Female : constricts vaginal orifice, branch (perineal artery)
pudendal nerve
assists in expressing secretions of greater vestibular gland, forces blood into body of clitoris
Compressor urethrae (female only)
Ischiopubic ramus
Perineal branches of pudendal nerve Sphincter of urethra
Deep transverse perineal
Inner surface of inferior ischial rami
External anal sphincter
Anterior aspect of urethra
Male: medial tendinous raphe and perineal body Female: sides of vagina
Deeper fibers surround anal canal, attach posteriorly to coccyx and Tip of coccyx, anococcygeal ligament
anteriorly to central point of perineum
Perineal branches of pudendal nerve
Stabilizes perineal body, supports prostate/vagina
Perineal and inferior rectal branches Closes anal orifice
of pudendal nerve
Inferior rectal and transverse perineal Perineal
artery
Deep branch of perineal nerve from Forces blood into body of penis and Internal pudendal artery and its pudendal nerve
clitoris during erection
branch (perineal artery)
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
Compresses urethra at end of Perineal branches of pudendal nerve micturition; in female also compresses the distal vagina
Sphincter urethrovaginalis (female only)
Perineal body
Passes forward and anterior around Perineal branches of pudendal nerve Sphincter of urethra and vagina
urethra
Central tendon (perineal body)
Perineal branches of pudendal nerve Stabilizes central tendon
Cremaster
Lower edge of internal oblique and middle of inguinal ligament
Pubic tubercle, crest of pubis
Genital branch of genitofemoral nerve
Retracts testicle
Perineal
Perineal branch of internal pudendal Perineal
artery
Inferior internal surface of Crus of penis or clitoris
ischiopubic ramus, ischial tuberosity
Ischial rami and tuberosities
Pelvic floor
Perineal branch of internal pudendal Perineal
artery
Ischiocavernosus
Superficial transverse perineal
Pelvic floor
Perineal
Perineal branch of internal pudendal Perineal
artery
Perineal branch of pudendal artery
Perineal
Perineal branch of internal pudendal Perineal
artery
Cremasteric branch of inferior Spermatic cord
epigastric artery
07/16/2015