- Gracilis muscle
Name = Gracilis muscle
Latin = musculus gracilis
GraySubject = 128
GrayPage = 471
Caption = The gracilis and nearby muscles
Caption2 = Gracilis labeled at center right.
Action = flexes
medial circumflex (branch of profunda femoral system)
anterior branch of obturator nerve
DorlandsPre = m_22
DorlandsSuf = 12549236
The Gracilis ("Latin:" slender) is the most superficial muscle on the
medialside of the thigh. It is thin and flattened, broad above, narrow and tapering below. It arises by a thin aponeurosis from the anterior margins of the lower half of the symphysis pubisand the upper half of the pubic arch.
The muscle's fibers run vertically downward, ending in a rounded tendon. This tendon passes behind the medial condyle of the
femur, curves around the medial condyle of the tibia where it becomes flattened, and inserts into the upper part of the medial surface of the body of the tibia, below the condyle. As a result of this the muscle is a lower limb adductor. At its insertion the tendon is situated immediately above that of the semitendinosusmuscle, and its upper edge is overlapped by the tendon of the sartoriusmuscle, which it joins to form the pes anserinus. The pes anserinus is separated from the medial collateral ligamentof the knee-jointby a bursa.
A few of the fibers of the lower part of the tendon are prolonged into the deep fascia of the leg.
The gracilis muscle is commonly used as a
flapin microsurgery. According to the classification of Mathes and Nahai it presents a type II blood supply. This allows it to be transferred on its artery derived from the medial circumflex femoral artery. This artery enters the muscle about 10cm from the pubic symphysis. At this point (or 1cm proximal) the nerve also enters.
Gracilis muscle is widely used in reconstructive surgery, either as a pedicled flap or as a free microsurgical flap. Both pedicled and free flaps can be muscular or musculocutaneos (the so- called "composite flaps"). As a pedicled flap, gracilis muscle can be used in perineal and vaginal reconstruction, after oncological surgery, in the treatment of recurrent anovaginal and rectovaginal fistulas as well in the coverage of the neurovascular bundle after vascular surgery [http://www.pelviperineology.org/coloproctology/gracilis_muscle_clinical_role.html] .
As a functioning pedicled flap the gracilis muscle can be transferred for the treatment of anal incontinence. This technique called graciloplasty was described in the 1950's by Pickrell and was revolutionized in the late 1980's by the introduction of chronic muscle electro-stimulation. The gracilis microsurgical free flap is commonly used in the reconstruction of upper and lower limbs, in breast reconstruction and, as a free functioning flap, to restore forearm function or in dynamic reconstruction of facial paralysis. [http://www.pelviperineology.org/coloproctology/gracilis_muscle_clinical_role.html Gracilis Muscles Clinical Role]
The muscle may be split to reduce bulk for
facial reanimation, as well as to repair hand muscles. It can be used to fashion an external anal sphincter. cite book|last=Moore|first=Keith|title=Essential Clinical Anatomy, 3rd ed|publisher=Lippincott Williams & Wilkins|year=2007]
* - "Muscles of the anterior (extensor) compartment of the
* - "Muscles that form the superficial boundaries of the
* [http://www.ptcentral.com/muscles/musclelegs.html#gracilis PTCentral]
* [http://www.pelviperineology.org/coloproctology/tables/gracils_muscles_clinical_role_fig.html#fig1 Functional CT and surgical figures]
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