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Muscle Cards

Exam 1

QuestionAnswer
Gluteus Maxiumus: Proximal and distal attachments Proximal: Ext. surface of ilium posterior to posterior gluteal line; iliac crest, dorsal surface of sacrum and coccyx; sacrotuberous ligament; superficial fascia of gluteus medius Distal: Most fibers end in IT; some into gluteal tuberosity
Nerve that innervates the Gluteus Maximus Inferior gluteal nerve (L5,S1,2)
Actions of Gluteus Maximus While running/climbing: extends flexed thigh; posterior fibers- lateral rotation of thigh; superior fibers powerful abductors; steadies thigh via IT band insertion. Assists in raising trunk from flexed position when fixed insertion.
Gluteus Medius: Proximal and distal attachments Proximal: External surface of ilium between anterior and posterior gluteal lines Distal: Superolateral surface of greater trochanter of femur
Nerve that innervates teh Gluteus Medius Superior Gluteal Nerve (L4,5,S1)
Actions of Gluteus Medius Abducts thigh; anterior fibers medially rotate thigh; steady pelvis; essential in keepin pelvis level when contralateral foot raised; when leg fixed, prevents abduction
Gluteus minimus: Proximal and distal attachments Proximal: External surface of ilium between anterior and inferior gluteal lines Distal: Anterolateral surface of greater trochanter of femur
Nerve that innervates the Gluteus minimus Superior Gluteal Nerve (L4,5,S1)
Actions of Gluteus Minimus Abducts thigh; medially rotates thigh; steadies pelvis; keeps pelvis level when contralateral foot raised; prevents abduction when leg fixed
Piriformis: Proximal and distal attachments Proximal: Anterior suface of sacrum and sacrotuberous ligament; ilium near PSIS Distal: Superior border of greater trochanter; some fibers blend with tendon of obturator internus and gemelli
Nerve that innervates the Piriformis Nerve to piriformis (S1,2)
Actions of Piriformis Laterally roates extended thigh; abducts flexed thigh; steadies femoral head in acetabulum
Gemelli (Superior and Inferior): Proximal and distal attachments Proximal: Superior- ischial spine Inferior- ischial tuberosity Distal: Medial surface of greater trochanter
Nerve that innnervates Superior and Inferior Gemelli Superior: Nerve to Obturator Internus (L5,S1,2) Inferior: Nerve to Quadratus Femoris (L4,5,S1)
Actions of Gemelli laterally rotates extended thigh, abducts flexed thigh, steadies femoral head in acetabulum
Obturator Internus: Proximal and distal attachments Proximal: Pelvic surface of obturator membrane and surrounding bones Distal: medial surface of greater trochanter of femur
Nerve that innervates the obturator internus Nerve to obturator internus (L5,S1,2)
Actions of Obturator Internus Laterally rotates extended thigh; abducts flexed thigh; steadies femoral head in acetabulum
Quadratus Femoris: Proximal and distal attachments Proximal: Lateral border of ischial tuberosity Distal: Quadrate tubercle on intertrochanteric crest of femur and inferior to it
Nerve that innervates quadratus femoris nerve to quadratus femoris (L4,5,S1)
Actions of quadratus femoris laterally rotates thigh; steadies femoral head in acetabulum
Semitendinosus: Proximal and distal attachments Proximal: Ischail tuberosity Distal: Superior part of medial surface of tibia
Nerve that innervates semitendinosus Tibial division of sciatic nerve (L4-S3)
Actions of semitendinosus Extends thigh; flexes and medially rotates leg; pulls trunk upright against gravity
Semimembranosus: Proximal and distal attachments Proximal: Ischial tuberosity Distal: Posterior part of medial condyle of tibia
Nerve that innervates semimembranosus Tibial division of sciatic nerve (L4-S3)
Actions of semimembranosus Extends thigh; flexes and medially rotates leg; pulls trunk upright against gravity
Biceps femoris: Proximal and distal attachments Proximal: Long head- ischial tuberosity Short head- lateral lip of linea aspera and lateral supracondylar line Distal: lateral side of head of fibula; tendon split at this site by fibular collateral ligament
Nerve that innervates biceps femoris Long head: tibial div. of sciatic (L4-S3) Short head: common fibular div. of sciatic (L4-S2)
Actions of biceps femoris flexes and latarally rotates leg; extends thigh; pulls trunk upright against gravity
Adductor magnus: Proximal and distal attachments Proximal: Inferior ramus of pubis, ramus of ischium (adductor part) and ischial tuberosity Distal: Gluteal tuberosity, linea aspera, medial supracondylar line (adductor part), adductor tubercle of femur (hamstring part)
Nerve that innervates adductor magnus Adductor part: (obturator nerve (L2,3,4) Hamstring part: (tibial div. of sciatic (L4-S3)
Actions of adductor magnus adducts thigh; adductor part flexes thigh; hamstring part extends thigh
Adductor brevis: Proximal and distal attachments Proximal: body and inferior ramus of pubis Distal: Pectineal line and proximal part of linea aspera
Nerve that innervates adductor brevis Obturator nerve (L2,3,4)
Actions of adductor brevis Adducts thigh; slightly flexes thigh
Adductor longus: Proximal and distal attachments Proximal: body of pubis inferior to pubic crest Distal: Middle third of linea aspera
Nerve that innervates adductor longus Obturator nerve (L2,3,4)
Actions of adductor longues adduts thigh
Gracilis: Proximal and distal attachments Proximal: Body and inferior ramus of pubis Distal: Superior part of medial surface of tibia
Nerve that innervates gracilis Obturator nerve (L2,3,4)
Actions of gracilis Adducts thigh; flexes leg; medially rotates leg
Obturator Externus: Proximal and distal attachments Proximal: Margins of obturator formaen and obturator membrane Distal: trochanteric fossa of femur
Nerve that innervates obturator externus Obturator nerve (L2,3,4)
Actions of obturator externus Laterally rotates thigh; steadies head of femur in acetabulum
Pectineus: Proximal and distal attachments Proximal: Pecten pubis Distal: Pectineal line of femur
Nerve that innervates pectinues femoral nerve (L2,3,4) may receive branch from Obturator N (L2,3,4)
Actions of Pectineus Adducts thigh; flexes thigh; flexes pelvis
Sartorius: Proximal and distal attachments Proximal: ASIS and superior notch inferior to it Distal: Superior part of medial surface of tibia
Nerve that innervates sartorius Femoral Nerve (L2,3,4)
Actions of sartorius Flexes, abducts, and laterally rotates thigh (+ knee flexion = cross legged sitting position)
Tensor fascia latae: Proximal and distal attachments Proximal: External surface of ASIS and anterior part of external lip of iliac crest; fascia lata Distal: IT tract that attaches to lateral condyle of tibia
Nerve that innervates TFL Superior gluteal nerve (L4,5,S1)
Actions of TFL Adducts and medially rotates thigh; helps keep knee extended; steadies trunk on thigh; stedies femur on tibia (most important in steadying pelvis)
Vastus lateralis: Proximal and distal attachments Proximal: greater trochanter, lateral lip of linea aspera Distal: base of patella and via patellar ligament to tibial tuberosity
Nerve that innervates vastus lateralis Femoral Nerve (L2,3,4)
Actions of vastus lateralis Extends leg at knee joint
Vastus medialis: Proximal and distal attachments Proximal: Intertrochanteric line; medial lip of linea aspera Distal: base of patella and via patellar ligament to tibial tuberosity
Nerve that innervates vastus medialis Femoral Nerve (L2,3,4)
Actions of vastus medialis Extends leg at knee joint
Vastus Intermedius: Proximal and distal attachments Proximal: Anterior and lateral surfaces of body of femur Distal: Base of patella and via patellar ligament to tibial tuberosity
Nerve that innervates vastus intermedius Femoral Nerve (L2,3,4)
Actions of vastus intermedius extends leg at knee joint
Articularis Genu: Proximal and distal attachments Proximal: Distal anterior surface of femoral shaft Distal: proximal reflection of synovial membrane of knee joint
Nerve that innervates articularis genu Femoral nerve (L2,3,4)
Actions of articularis genu retracts supra-patellar bursa during knee extension
Rectus femoris (kicking muscle): Proximal and distal attachments Proximal: Straight head- AIIS Reflected head - groove superior to acetabulum Distal: base of patella and via patella ligament to tibial tuberosity
Nerve that innervates rectus femoris: Femoral nerve: (L2,3,4)
Actions of rectus femoris Extends leg at knee joint; steadies hip joint; helps iliopsoas to flex thigh
Created by: elvis82