Unit 3 - Post. Thigh Muscles

Question 1

Hamstring muscles (3)

Answer 1

Semimembranosus
Semitentinosus
Biceps Femoris

Question 2

All hamstring muscles have what attachment?

Answer 2

Proximal attachment to the ischial tuberosity

Question 3

Hamstrings span what 2 joints

Answer 3

Hip

Knee

Question 4

Hamstrings movement

Answer 4

Extends the thigh and flex the leg

Question 5

Innervation of hamstrings

Answer 5

Tibial branch of the sciatic nerve

Question 6

What part of biceps femoris is NOT considered a hamstring

Answer 6

Short head

Question 7

Full flexion of the knee does what to hip extension

Answer 7

Impairs it-

And full hip extension impairs knee flexion

Question 8

Active insufficiency

Answer 8

The inability of a muscle, which spans two or more joints to exert enough tension and shorten sufficiently to cause a full range of movement in all joints at the same time

Question 9

Passive insufficiency

Answer 9

The inability of a muscle that spans two or more joints to be stretched sufficiently to produce a full range of motion in all the joints simultaneously

Question 10

When the thigh and leg are fixed, the hamstrings:

Answer 10

Extend the trunk at the hip joint

Question 11

Hamstring muscles are involved in ______ and most active during:

Answer 11

Walking

During an eccentric contraction resisting hip flexion and knee extension

Question 12

OINA for semitendinosus

Answer 12

OR: Ischial tuberosity

INS: Pes anserinus, medial tibia

NS: Tibial division, sciatic nerve

AC: Flexes leg
Extends thigh
Extends the trunk when leg/thigh is fixed

Question 13

Tendons of the pes anserinus

Answer 13

Semitentinosus tendon
Gracilis tendon
Sartorius tendon

Question 14

OINA for semimembranosus

Answer 14

OR: Ischial tuberosity

INS: Post. Medial condyle of tibia

NS: Tibial division, sciatic nerve

AC: Flexes leg
Extends thigh
Extends the trunk when leg/thigh is fixed

Question 15

3 distal attachment parts for the semimembranosus

Answer 15

1- direct attachment to the post. Medial tibial condyle (most direct)

2- part blends with the popliteal fascia

3- reflected part (oblique popliteal ligament) reinforces the intercondylar part of the knee capsule

Question 16

OINA for biceps femoris

Answer 16

OR: Long head- ischial tuberosity
Short head- linea aspera and supracondylar ridge of femur

INS: Head of fibula

NS: Long head- Tibial division, sciatic nerve
Short head- Common perineal division, sciatic nerve

AC: Flexes leg
Extends thigh

Question 17

The long head of biceps femoris covers the:

Answer 17

Sciatic nerve as it descends from the medial gluteal region through the posterior thigh to the popliteal fossa

Question 18

Sciatic nerve comes out underneath the:

Answer 18

Piriformis