Pelvic and Perineal Myology Flashcards
perineal body
is an irregular fibromuscular mass in the midline between the Anal Canal and the Perineal Membrane, it contains Collagenous and Elastic Fibers and is the attachment point for the
Bulbospongiosus M, External Anal Sphincter M., Superficial Transverse Perineal M. and Deep
Transverse Perineal M.
superficial transverse perineal M.
O: Ischiopubic Ramus and Ischial Tuberosity
I: Perineal Body
A: Support and fix Perineal Body, supports Abdominopelvic
Viscera and resists increases in Intraabdominal Pressure
N: Deep Perineal N.
ischiocavermosus M.
O: Ischiopubic Ramus and Ischial Tuberosity
I: Medial aspect of the Crus of the Penis (M) or Clitoris (F) and
Perineal Membrane medial to the Crura (B)
A: Maintain erection of Penis or Clitoris by compressing venous
drainage, forcing blood from the Crura into the body of the Penis or Clitoris
N: Deep Perineal N.
bulbospongiosus M.
O: Median Raphe, ventral Bulb of Penis and Perineal Body (M),
Perineal Body (F)
I: Perineal Membrane, fascia of Bulb of Penis and Corpus
Spongiosum and Corpora Cavernosa of the Penis (M); fascia of Bulb of
the Vestibule of Vagina, Pubic Arch and fascia of the Corpora Cavernosa
of the Clitoris (F)
A: Support and fix Perineal Body (B); compress Bulb of Penis,
assist erection by compressing venous drainage, forcing
blood from the Root of the Penis to the Body of the Penis, expels final
drops of Urine/ Semen from the Urethra (M); compresses Vaginal orifice, assist in erection of Bulbs of Vestibule of Vagina and compresses the Greater Vestibular Gland(F)
N: Deep Perineal N.
external urethral sphincter M.
O: Surrounds the Urethra
I: Surrounds the Urethra
A: Constrict Urethra maintaining urinary continence
N: Dorsal Nerve of the Penis (M) or Clitoris (F)
compressor urethrae M
O: Ischiopubic Ramus and Ischial Tuberosity
I: Median Raphe and Urethra via External Urethral Sphincter M.
A: Constrict Urethra maintaining urinary continence
N: Dorsal Nerve of the Penis (M) or Clitoris (F)
urethrovaginal sphincter M
O: Ischiopubic Ramus and Ischial Tuberosity
I: External wall of the Vagina
A: Compresses the Vagina
N: Dorsal Nerve of the Clitoris (F)
deep transverse perineal M (M)
O: Ischiopubic Ramus and Ischial Tuberosity
I: Median Raphe, Perineal Body and External Anal Sphincter
A: Support and fix Perineal Body, supports Abdominopelvic
Viscera and resists increases in Intraabdominal Pressure
N: Deep Perineal N.
deep transverse perineal M in females
described as being smooth muscular mass
along the posterior edge of the Perineal Membrane
external anal sphincter M
O: Skin and fascia surrounding Anus and Anococcygeal Body
I: Perineal Body
A: Constricts the Anal Canal during Peristalsis, resists Defecation,
supports and fix Perineal Body
N: Inferior Rectal N.
internal anal sphincter M.
involuntary Sphincter surrounding superior 2/3 of Anal Canal, thickening of circular muscular layer
innervated by parasympathetic fibers from Pelvic Splanchnic
nerves
pelvic diaphragm
the three Levator Ani Ms. (Puborectalis M.,
Pubococcygeus M., and Iliococcygeus M.) and the Coccygeus M
puborectalis M.
O: Posterior aspect of the Pubic Body
I: External wall of the Rectum and Anal Canal
A: Maintain Anorectal Flexure, supports Pelvic Viscera,
resists increases in Intraabdominal Pressure
N: Nerve to the Levator Ani M. (S4), Inferior Rectal N.,branches of the Coccygeal Plexus
pubococcygeus M.
O: Posterior aspect of the Pubic Body and anterior most
part of the Tendinous Arch of Obturator Fascia
I: Coccyx, Anococcygeal Body, contralateral
Pubococcygeus M.
A: Supports Pelvic Viscera, resists increases in Intraabdominal Pressure
N: Nerve to the Levator Ani M. (S4), Inferior Rectal N., branches of the Coccygeal Plexus
pubococcygeus M.
produces several small slips of muscle that extend to nearby structures, all sharing similar action and innervation as the Pubococcygeus M. These muscles include the
Levator Prostatae M. (M), the Pubovaginalis M. (F) and the Puboperinealis M. and Puboanalis M. in
both.
iliococcygeus M.
O: Posterior part of the Tendinous Arch of Obturator fascia
and Ischial Spine
I: Coccyx and Anococcygeal Body
A: Supports Pelvic Viscera, resists increases in Intraabdominal Pressure
N: Nerve to the Levator Ani M. (S4), Inferior Rectal N., branches of the Coccygeal Plexus
coccygeus M.
O: Ischial Spine
I: Inferior Sacrum and Coccyx
A: Support Pelvic Viscera, flexes Coccyx
N: Nerve to the Coccygeus (S4,5; branches of the Coccygeal Plexus)
obturator internus M
O: Pelvic surfaces of the Ilium and Ischium and Obturator Membrane
I: Greater Trochanter of the Femur
A: Rotate Thigh laterally, stabilize the Femoral Head in the Acetabulum
N: Nerve to the Obturator Internus M.
piriformis M
O: Pelvic surfaces of the Ilium and Ischium and Obturator Membrane
I: Greater Trochanter of the Femur
A: Rotate Thigh laterally, stabilize the Femoral Head in the Acetabulum
N: Nerve to the Obturator Internus M.
