pelvic muscles
posterolateral wall of the pelvis is partially closed by the piriformis and obturator internus belonging to the lower limb. The bottom wall is closed by a muscle-fascial whole perineum. Piriformis muscle
Originated in the pelvis out of it by the greater sciatic foramen and passes through the gluteal region, which is a key structure for addressing the neurovascular pedicles.
O: face pelvic sacral vertebrae II, III and IV, between the foramen pelvic and between the grooves that extend laterally.
-Top edge greater sciatic notch.
-sacrotuberal Anterior ligament.
I: superior border of greater trochanter.
N: sacral plexus (LV, SI and SII)
A: abductor and lateral rotator of the femur. Internal obturator muscle
:
has a broad origin on the pelvis and out the lower sciatic foramen and crosses horizontally coxal joint.
O: inside of the obturator membrane.
-contour of the obturator foramen to the line terminal.
-obturator fascia.
-range fibers converge to four or 5 tabs tendon reflected at right angles lesser sciatic notch, separated from it by the bag ischial internal shutter.
I: medial aspect of the greater trochanter forward and above the trochanteric fossa.
N: nerve to obturator internus and superior twin (LV, SI and SII)
A: abductor and lateral rotator of the femur. Set
PERINEUM soft tissue at the lower pelvic cavity closed.
Its Limits osteo-fibrous framework diamond shape formed earlier by the lower edge of the symphysis pubis and ischium-pubic branch, and subsequently by the apex of the coccyx and sacro-tuberous ligament.
A horizontal line that goes from one ischial tuberosity the other divides the perineum into two triangular segments, one rear and one earlier. The rear triangle is pierced by the anal canal, the anal region (triangle anal). The anterior triangle is traversed by the urethra in men and the urethra and vagina in women, is the urogenital region (urogenital triangle).
A different lines that cross through the perineum in the median plane are attached the muscles and fascia sphincter by promoting their role.
perineal muscles are arranged in different planes and each plane has its own fascia. The deep layer is the diaphragm of the pelvis formed by the levator ani muscles and coccyx, which are described in the sphincter external anal. In the front of the perineum, exclusively, there is a medium shot, the urogenital diaphragm is comprised of the external sphincter muscles of the urethra and deep transverse perineal. The flat surface composed of the muscles associated with the external genitalia: superficial transverse perineal, external anal sphincter, and bulb-hamstring-cavernous spongy. PLANO
DEEP PELVIC DIAPHRAGM OR
levator ani muscles and coccyx form a partition or septum superiorly concave and convex downward, like the hull of a ship, which extends between the walls of the pelvis. Presented in the line stretched half a hole from anterior to posterior, from pubis to the rectum to allow the passage of the urethra, blood vessels and nerves of the penis or clitoris and vagina in women. Therefore it is deficient in the anterior and median, then crossed the ano-rectal junction. Has the ability to increase abdominal pressure with the abdominal muscles.
levator ani muscle
Both levator ani muscles confined between them in the midline before the anus an opening called the urogenital hiatus.
We divided into two parts: a medial and sagittal pubic origin, and lateral iliac origin. Pubococcygeus muscle
:
O: inner side of the body and upper branch of the pubis, until the channel stopper.
I: lifting plate formed by the intersection of the fascicles of both sides (median raphe).
-apex of the coccyx bone.
A: Moves the upper anal canal and above, also tends to dilate the duct and participates in the voluntary control of urination.
Levator prostate or pubovaginal muscle in women: the pubococcygeus medial fascicles
O: inside of the body of the pubis. Limits
genital hiatus and the man crosses the gap of the prostate, in women, the union of the upper two-thirds to the lower third of the vagina, to which it adheres.
I: central tendon of the perineum
A: the pubovaginal involved in intercourse by intermittent contractions prelude to orgasm. Puborectalis
: includes medial and inferior fascicles, visible on the underside of the levator ani muscle.
O: inside of the body of the pubis. Mix
its fibers like the pubococcygeus muscle in the tunic of the rectum and descending tracts gives the longitudinal portion of the rectum.
I: it joins the muscle heterolateral forming a hammock behind the perineal flexure of rectum.
A: contingency anal.
iliococcygeus:
sometimes developed, sometimes fibrous, the fibers are more transverse the more later.
O: inside of the spine ischial.
-tendinous arch of levator ani muscle. Most fibers are mixed with the obturator fascia and ascend with it to the finish line.
I: lifting plate (median raphe) of the levator ani muscle.
-edges and apex of the coccyx bone.
N: sacral plexus, nerve branches to the levator ani (SIII and SIV).
A: compresses the straight lateral to medial rectus are as constrictors.
coccygeus or isquiococcígeo:
is a sheet muscle tendon, triangular, located posterior to the levator ani muscle.
O: medial aspect of the ischial spine
-edge of the greater sciatic notch.
-pelvic surface sacrospinous ligament.
I: lateral margin of the last sacral and first two coccygeal.
N: sacral plexus (SIII and SIV)
A: in addition to the levator ani muscle that are inserted into the coccyx to oppose further tilting movement of the bone and build support for pelvis organs.
external anal sphincter muscle
largely regarded as a branch of the levator ani. Divided into 3 parts: Part subcutaneous
: Located near the anal opening, consists of concentric fibers decussate anteriorly and posteriorly the anal canal, separated from this channel only for terminal disintegration of the fibers of the stratum longitudinal rectum.
The superficial part: It surrounds the upper end of the subcutaneous muscle fibers consisting of elliptical, extended horizontally from the apex of the coccyx bone and ligament anococcygeal, the central tendon of the perineum, where it continues to bulboesponjoso muscle.
The deep end: Form a muscular tube that surrounds the top of the anal canal, then merges with the puborectalis muscle to form the anorectal ring, formerly fibers terminate in the central tendon and others are mixed with the superficial transverse muscle.
UROGENITAL DIAPHRAGM PLANE MEDIUM OR
Ranges between 2 branches ischio, is located in the urogenital region and muscles of the perineum are between the two fascial sheets of the pelvic diaphragm.
deep transverse perineal muscle
O: ischium and ischial pubic ramus.
I: central tendon of the perineum
-side wall of the vagina in women.
N: perineal branches of the pudendal nerve (SII AND SIV).
A: fixes the central tendon and supported by the bodies. Compress the veins of the two erectile bodies that cross so involved in erection.
The center of the perineum or perineal body is a fibromuscular mass located in the median plane between the diaphragm urogenital and anal canal. Fibers converge there 8 muscles: levator ani, and deep transverse surface of the anus and sphincter bulboesponjoso sternum.
urethral sphincter muscle:
surrounds the membranous urethra and the underside of the female urethra.
O: union of the lower branches of the pubis and ischium.
-walls adjacent deep perineal space.
I: crossing of fibers before and after the urethra in women is mixed behind the deep transverse muscle. The deep fibers in man ring, stretch up on the anterolateral part of the prostate.
N: perineal branches of the pudendal nerve (SII AND SIV).
A: role in the urinary sphincter. FLAT SURFACE OR
superficial perineal muscles
superficial transverse perineal muscle:
sometimes absent, muscle is a thin reed.
O: medial border of the ischial tuber
I: central tendon of the perineum
N: pudendal nerve (SII, SIII and SIV)
A: fixing the central tendon attachment. Muscle
ischiocavernosus:
form of semi-cone has applied to the free surface of the cross of the penis or clitoris.
O: medial border of the ischial tuberosity and ischial industry.
I: medial side and bottom of the cross of the penis or clitoris, near the junction of the corpora cavernosa.
N: pudendal nerve
A: it plays a role in the erection discussed. Muscle
bulboesponjoso:
form in man, with the opposite side, a semivaina covering the bulb and back of the body spongiosa penis. In women, the muscle is separated contralateralpor the lobby of the vagina.
O: central tendon of the perineum, continuous with the fibers of the external anal sphincter muscle.
I: inferior fascia of urogenital diaphragm (posterior fibers).
-Dorsal penile body spongiosa (middle fibers).
-deep fascia of the dorsum of the penis or clitoris, after circling the homolateral cavernous body (anterior fibers).
A: in the erection like ischiocavernosus by compressing the erectile bodies of blood to the front of them. The anterior fibers of this muscle closes the venous return by compressing the deep dorsal penile vein
-in women, and bulboesponjoso ischiocavernosus down the clitoris during intercourse and apply his penis against the penis, in addition to the vestibular gland compresses bulboesponjoso higher.
FASCIA OF THE PELVIS facial
There are 3 levels of the 3 perineal fascial planes of the 3 perineal muscle planes
FASCIA OF THE PELVIC DIAPHRAGM
The pelvic diaphragm is covered on both sides by a fascia. Fascia
top of the diaphragm of the pelvis:
covers the face top of the elevators and the coccyx, is continuous with the obturator fascia laterosuperiormente, reaching the line of the tendinous arch of levator ani muscle, which appears to be inserted into the muscle, limiting both fascias.
lower fascia of the pelvic diaphragm
is thin and covers the underside of the levator ani and coccygeal and corresponds to the ischiorectal fossa. FASCIA
UROGENITAL DIAPHRAGM As the former has two Fascias an upper and lower covering both sides of the muscles that make up and spread as they ischio between the two branches, the lower fascia is sometimes called perineal membrane is stronger and dense than the upper. Later the two fascias are lost in the central tendon of the perineum, and sides are joined at the back edge of the deep transverse. Previous to the urethral sphincter, the two fascias to merge to form the thick transverse ligament of perineum. The 2 fascias limit perineal deep space, filled with his muscles and traversed by the urethra. SUPERFICIAL FASCIA
Perineum
is thin and is of the underside of the superficial muscles. Laterally
is inserted in the fields below ischiatic ischiocavernosus. The Hormbre
:
Back: confused in the midline with the perineal body, while their sides, outline the posterior border of superficial transverse perineal and continue with the superficial penile fascia and tunica dartos of the scrotum.
In Women:
Continue ahead to the fascia of the clitoris and descends medially in the connective tissue at the base of the labia minora. Between the inferior fascia of urogenital diaphragm and superficial fascia of the perineum is located superficial perineal space.
BIBLIOGRAPHY Ø Chatain L. Ives, B. Jairo Bustamante, gross anatomy FUNCTIONAL CLINICA Y; Ed Addison-Wesley Iberoamericana, Paj. 169-174. Ø
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Richard L. Drake, Wayne Vogl, Adam WM Mitchell, ESTUDIANTES ANATOMY TO GRAY; Ed ELSEVIER
Ø Frank H. Netter, ATLAS OF HUMAN ANATOMY; 2 Edición, Ed Masson SA; Blades 333-336.