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Unit 2 Muscles > Week 3 Muscles > Flashcards

Week 3 Muscles Flashcards

1
Q

Gluteus Maximus

A

O: Ilium posterior to posterior gluteal line, dorsal surface of sacrum and coccyx, sacrotuberous ligament

I: Most fibers end in iliotibial tract
that inserts into lateral condyle of tibia; some fibers insert into gluteal tuberosity of femur

I: Inferior gluteal nerve (L5, S1, S2)

B: Inferior gluteal arteries mainly,
and superior gluteal arteries occasionally

A: Extends flexed thigh, assists in lateral
rotation, and abducts thigh

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2
Q

Gluteus Medius

A

O: Lateral surface of ilium between anterior
and posterior gluteal lines

I: Lateral surface of greater
trochanter of femur

I: Superior gluteal nerve (L5, S1)

B: Superior gluteal artery

A: Abducts and medially rotates thigh at hips; steadies pelvis on leg when opposite leg is raised

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3
Q

Gluteus Minimus

A

O: Lateral surface of ilium between anterior
and inferior gluteal lines

I: Anterior surface of greater
trochanter of femur

I: Superior gluteal nerve (L5, S1)

B: Main trunk and deep branch of superior gluteal artery

A: Abducts and medially rotates thigh at hips; steadies pelvis on leg when opposite leg is raised

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4
Q

Inferior Gemellus

A

O: Ischial tuberosity

I: Medial surface of greater
trochanter of femur

I: Nerve to quadratus femoris

B: Medial circumflex femoral artery

A: Laterally rotates extended thigh at the hip

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5
Q

Superior Gemellus

A

O: Outer surface of ischial spine

I: Medial surface of greater
trochanter of femur

I: Nerve to obturator internus

B: Inferior gluteal and internal
pudendal arteries

A: Laterally rotates extended thigh at the hip

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6
Q

Tensor fasciae latae

A

O: Anterior superior iliac spine and anterior part of iliac crest

I: Iliotibial tract that attaches to
lateral condyle of tibia

I: Superior gluteal nerve (L5, S1)

B: Ascending branch of lateral
circumflex femoral artery

A: Abducts, medially rotates, and flexes thigh at hip; helps to keep knee extended

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7
Q

Piriformis

A

O: Anterior surface of sacral segments 2–4, sacrotuberous ligament

I: Superior border of greater
trochanter of femur

I: Ventral rami of L5, S1, S2

B: Superior and inferior gluteal arteries, internal pudendal artery

A: Laterally rotates extended thigh, abducts flexed thigh at hip

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8
Q

Obturator Internus

A

O: Pelvic surface of obturator membrane and surrounding bone

I: Medial surface of greater
trochanter of femur

I: Nerve to obturator internus (L5, S1)

B: Internal pudendal and obturator arteries

A: Laterally rotates extended thigh, abducts flexed thigh at hip

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9
Q

Quadratus Femoris

A

O: Lateral margin of ischial tuberosity

I: Quadrate tubercle on intertrochanteric crest of femur

I: Nerve to quadratus femoris (L5, S1)

B: Medial circumflex femoral artery

A: Laterally rotates thigh at hip

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10
Q 
Rectus Femoris (Quadriceps)
(Anterior Thigh)
A

O: Anterior inferior iliac spine and ilium superior to acetabulum

I: Base of patella and to tibial
tuberosity via patellar ligament

I: Femoral nerve (L2, L3, L4)

B: Profunda femoris and lateral circumflex
femoral arteries

A: Extends leg at knee joint and flexes
thigh at hip joint

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11
Q 
Vastus Lateralis (Quadriceps)
(Anterior Thigh)
A

O: Greater trochanter, lateral lip of linea aspera of femur

I: Base of patella and to tibial
tuberosity via patellar ligament

I: Femoral nerve (L2, L3, L4)

B: Lateral circumflex femoral and profunda femoris arteries

A: Extends leg at knee joint

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12
Q 
Vastus medialis (quadriceps)
(Anterior Thigh)
A

O: Intertrochanteric line, medial lip of linea aspera of femur

I: Base of patella and to tibial
tuberosity via patellar ligament

I: Femoral nerve (L2, L3, L4)

B: Femoral and profunda
femoris arteries

A: Extends leg at knee joint

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13
Q 
Vastus intermedius (quadriceps)
(Anterior Thigh)
A

O: Anterior and lateral surfaces of body of femur

I: Base of patella and to tibial
tuberosity via patellar ligament

I: Femoral nerve (L2, L3, L4)

B: Lateral circumflex femoral and profunda femoris arteries

A: Extends leg at knee joint

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14
Q

Adductor Longus

Medial Thigh

A

O: Body of pubis inferior to pubic crest

I: Middle third of linea aspera of femur

I: Obturator nerve (anterior division) (L2, L3, L4)

B: Profunda femoris and medial circumflex femoral arteries

A: Adducts thigh at hip

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15
Q

Adductor brevis

Medial Thigh

A

O: Body and inferior pubic ramus

I: Pectineal line and proximal part of linea aspera of femur

I: Obturator nerve (L2, L3, L4)

B: Profunda femoris, medial
circumflex, femoral, and obturator arteries

A: Adducts thigh at hip, weak hip flexor

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16
Q

Adductor magnus

Medial Thigh

A

O: Inferior pubic ramus, ramus of ischium
Hamstring part: sciatic nerve (tibial division)

I: Gluteal tuberosity, linea aspera, medial supracondylar line
Hamstring part:
adductor tubercle of femur

I: Adductor part:
obturator nerve (L2, L3, L4)
Hamstring part:
sciatic nerve (tibial division) (L4)

B: Femoral, profunda femoris, and obturator arteries

A: Adductor part: adducts and flexes thigh
Hamstring part: extends thigh

17
Q

Gracilis

Medial Thigh

A

O: Body and inferior ramus of pubis

I: Superior part of medial surface of tibia

I: Obturator nerve (L2, L3)

B: Profunda femoris artery, medial circumflex femoral artery

A: Adducts thigh, flexes and medially rotates leg

18
Q

Obturator Externus

Medial Thigh

A

O: Margins of obturator foramen, obturator membrane

I: Trochanteric fossa of femur

I: Obturator nerve (L3, L4)

B: Medial circumflex femoral artery, obturator artery

A: Laterally rotates thigh, stabilizes head of femur in acetabulum

19
Q

Pectineus

Anterior Thigh

A

O: Superior ramus of pubis

I: Pectineal line of femur

I: Femoral nerve and sometimes obturator nerve

B: Medial circumflex femoral artery, obturator artery

A: Adducts and flexes thigh at hip

20
Q

Semitendinosus

Posterior Thigh

A

O: Ischial tuberosity

I: Superior part of medial surface
of tibia

I: Sciatic nerve (tibial division) (L5, S1, S2)

B: Perforating branch of profunda femoris and
medial circumflex femoral arteries

A: Flexes leg, extends thigh

21
Q

Semimembranosus

Posterior Thigh

A

O: Ischial tuberosity

I: Posterior part of medial condyle of tibia

I: Sciatic nerve (tibial division) (L5, S1, S2)

B: Perforating branch of profunda femoris and
medial circumflex femoral arteries

A: Flexes leg, extends thigh

22
Q

Biceps femoris

Posterior Thigh

A

O: Long head: ischial tuberosity
Short head: Linea aspera and lateral supracondylar line of femur

I: Lateral side of head of fibula

I: Long head:
sciatic nerve (tibial division) (L5–S2)
Short head:
sciatic nerve (common fibular division) (L5, S1, S2)

B: Perforating branches of profunda femoris, inferior gluteal, and medial circumflex femoral arteries

A: Flexes and laterally rotates leg, extends thigh at hip

23
Q 
Psoas major (Iliopsoas)
(Anterior Thigh)
A

O: Transverse processes of lumbar vertebrae, sides of bodies of T12–L5 vertebrae, intervening intervertebral discs

I: Lesser trochanter of femur

I: Ventral rami of first lumbar nerve

B: Lumbar branches of iliolumbar artery

A: Acting superiorly with iliacus, flexes hip; acting inferiorly, flexes vertebral column laterally; used to balance trunk in sitting position; acting inferiorly with iliacus, flexes trunk

24
Q

Iliacus (Iliopsoas)

Anterior Thigh

A

O: Superior 2/3 of iliac fossa, iliac crest, ala of sacrum, anterior sacro-iliac ligaments

I: Lesser trochanter of femur and shaft
inferior to it, to psoas major tendon

I: Femoral nerve

B: Iliac branches of iliolumbar artery

A: Flexes thigh at hips and stabilizes hip joint, acts with psoas major

25
Q

Sartorius (Anterior Thigh)

A

O: Anterior superior iliac spine and superior part of notch below it

I: Superior part of medial surface of tibia

I: Femoral nerve

B: Femoral artery

A: Abducts, laterally rotates, and flexes thigh;
flexes knee joint

26
Q

Psoas minor

A

O: Vertebral margins of T12–L1
vertebrae, corresponding intervertebral disc

I: Pectineal line, iliopectineal
eminence

I: Ventral rami of first lumbar nerve

B: Lumbar branch of iliolumbar artery

A: Flexes pelvis on vertebral column

27
Q

Quadratus lumborum

A

O: Medial half of inferior border of 12th
rib, tips of lumbar transverse processes

I: Iliolumbar ligament, internal lip of iliac crest

I: Ventral rami of T12 and first four lumbar nerves

B: Iliolumbar artery

A: Extends and laterally flexes vertebral column, fixes 12th rib during inspiration

Unit 2 Muscles (10 decks)

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