Muscles of the Manus

Question 1

Tensor faciae latae

Answer 1

Origin: tuber coxae

Termination: fascia latae

Action: tense the fascia lata

(flex the coxal joint and extend the genual joint)

Question 2

Superficial gluteal

Answer 2

Origin: sacrotuberous ligament

Termination: third trochanter of the femur

Action: abduct the limb

Question 3

Middle gluteal

Answer 3

Origin: gluteal surface of ilium

Termination: greater trochanter of the femur

Action: extend the coxal joint; abduct the limb

Question 4

Piriformis

Answer 4

Origin: sacrum and first caudal vertebra

Termination: greater trochanter

Action: extend the coxal joint

Question 5

Deep gluteal

Answer 5

Origin: body of ilium and ischiatic spine

Termination: greater trochanter

Action: abduct the limb and extend the coxal joint

Question 6

External obturator

Answer 6

Origin: ventral aspect of os coxae around obturator of humerus

Termination: trochanteric fossa

Action: adduct and/or rotate the limb laterally at the coxal joint

Question 7

Internal obturator

Answer 7

Origin: dorsal aspect of os coxae around obturator foramen

Termination: trochanteric fossa

Action: rotate the limb laterally at the coxal joint

Question 8

Quadratus femoris

Answer 8

Origin: ventral aspect of ischium

Termination: caudal femur near the trochanteric fossa

Action: extend coxal joint; adduct and/or rotate the limb laterally at the coxal joint

Question 9

Biceps femoris

Answer 9

Origin: ischiatic tuberosity

Termination: tibia and tuber calcanei

Action: extend coxal joint; variable action on genual joint; extend the tarsocrural joint

Question 10

Semitendenosus

Answer 10

Origin: ischiatic tuberosity

Termination: tibia and tuber calcanei

Action: extend coxal joint; variable action on the genual joint; extend tarsocrural joint

Question 11

Semimembranosus

Answer 11

Origin: ischiatic tuberosity

Termination: distal femur and proximal tibia

Action: extend coxal joint: variable action on genual joint

Question 12

Sartorius

Answer 12

Cranial and caudal bellies!

Origin: crest of ilium

Termination: medial aspect of genual region

Action: flex coxal joint, extend(cr) or flex (cd) genual joint

Question 13

Gracilis

Answer 13

Origin: pelvic symphasis

Termination: medial aspect of genual region

Action: adduct the limb, extend coxal joint, flex genual joint, extend tarsocrural joint

Question 14

Pectineus

Answer 14

Origin: iliopubic eminence

Termination: distal body of femur

Action: adduct the limb

Question 15

Adductor

Answer 15

Origin: vental surface of os coxae

Termination: caudal surface of femur

Action: adduct the limb and extend the coxal joint

Question 16

Quadriceps femoris

(rectus femoris, vastus lateralis, vastus intermedius, vastus medialis)

Answer 16

Origin: rectus femoris- ilium

other 3 heads: proximal femur

Termination: tibial tuberosity

Action: flex coxal joint (rectus femoris)

extend genual joint (all heads)

Question 17

Iliopsoas

Answer 17

Origin (don’t have to know)

Termination: lesser trochanter

Action: flex coxal joint

Question 18

Cranial tiial

Answer 18

Origin: lateral aspect of proximal tibia

Termination: plantar base of metatarsal bones 1 and 2

Action: flex tarsocrural joint

Question 19

Long digital extensor

Answer 19

Origin: extensor fossa of femur

Termination: extensor process of distal phalanges

Action: extend the genual joint; flex tarsocrural joint; extend digital joints

Question 20

Lateral digital extensor

Answer 20

Origin (N/A)

Termination: lateral digits (4,5)

Action: flex the tarsocrural joint; extend digital joints

Question 21

Peroneus longus

Answer 21

Origin: lateral collateral ligament of genual joint

Termination: 4th tarsal bone and planar base of metatarsal bones

Action: flex tarsocrural joint

Question 22

Gastrocnemius

(medial and lateral heads)

Answer 22

Origin: distal caudal femur

Termination: tuber calcanei of calcaneous

Action: flex genual joint; extend tarsocrural jont

Question 23

Superficial digital flexor

Answer 23

Origin: femur

Termination: tuber calcanei and bases of middle phalanges

Action: flex genual joint; extend tarsocrural joint; flex metatarsophalangeal and proximal interphalangeal joints

Question 24

Deep digital flexor

(medial and lateral heads)

Answer 24

Origin: proximal caudal aspect of tibia and fibula

Termination: flexor tubercle of distal phalanges

Action: extend the tarsocrural joint; flex digital joint

Question 25

Popliteus

Answer 25

Origin: popliteal fossa of femur

Termination: proximal caudal aspect of tibia

Action: flex genual joint