POSTERIOR THIGH MUSCLES (HAMSTRINGS)

Question 1

1. semitendinosus
2. semimembranosus
3. biceps femoris
   􀁸 these muscles are known collectively as the**

Answer 1

hamstring muscles

Question 2

hamstring muscles have a common origin (except the short head of the biceps femoris) from the….**

Answer 2

ischial tuberosity

Question 3

hamstring muscles are all supplied by what nerve

Answer 3

sciatic nerve (L4-S3)

Question 4

􀁸 the muscle is situated on the medial-posterior aspect of the femur
􀁸 it is medial to the biceps femoris and is superficial to the semimembranosus
􀁸 its tendon of insertion is very long and thus gives the muscle its name

Answer 4

Semitendinosus

Question 5

Semitendinosus origin:

Answer 5

ischial tuberosity

Question 6

Semitendinosus insertion:

Answer 6

medial condyle/ tibia

Question 7

Semitendinosus action:

Answer 7

flexion at the leg at the knee

Question 8

Semitendinosus nerve supply:

Answer 8

sciatic nerve (L4-S3)

Question 9

􀁸 this is the name given to describe the tendons of insertion of the semitendinosus, gracilis and sartorius
􀁸 the name translates to “Goose’s Foot”**

Answer 9

Pes Anserinus

Question 10

􀁸 this muscle is named because of the flattened nature of the its proximal attachment
􀁸 proximally it lies deep to the semitendinosus

Answer 10

Semimembranosus

Question 11

Semimembranosus origin:

Answer 11

ischial tuberosity

Question 12

Semimembranosus insertion:

Answer 12

medial condyle/ tibia

Question 13

Semimembranosus action:

Answer 13

flexion at the leg at the knee

Question 14

Semimembranosus nerve supply:

Answer 14

sciatic nerve (L4-S3)

Question 15

this is the most laterally situated of the hamstring muscles

Answer 15

Biceps Femoris

Question 16

Biceps Femoris origin:

Answer 16

ischial tuberosity (L.H.)

Linea Aspera (S.H.)

Question 17

Biceps Femoris insertion:

Answer 17

head/fibula

lateral condyle/tibia

Question 18

Biceps Femoris action:

Answer 18

flexion at the leg at the knee

Question 19

Biceps Femoris nerve supply:

Answer 19

sciatic nerve (L4-S3)

Question 20

the length of the muscles will vary considerable from one individual to another

in some individuals they are not long enough to allow someone to touch their toes when they flex their
vertebral column and keep their legs from flexing at the knee joint

in other individuals, this muscle is long and flexible enough that these individuals can easily touch
their toes with little or no flexion at the knee joint

Answer 20

Length of the Hamstrings

Question 21

􀁸 is a common sports injury
􀁸 it is twice as common as strains of the quadriceps
19
􀁸 seen in athletes who run very hard and have quick starts

Answer 21

Pulled Hamstring

Question 22

may result from forcible flexion of the hip when the knee is extended**

Answer 22

Avulsion of the Ischial Tuberosity

Question 23

Actions of the hamstrings

All muscles:**

Answer 23

Flexion of the leg at the knee joint


Question 24

Actions of the hamstrings

All except the short head of the biceps femoris**

Answer 24

• stabilize the hip joint




- extension of the femur

Question 25

Actions of the hamstrings

The semitendinosus and semimembranosus also**

Answer 25

medialy rotates the leg


Question 26

Actions of the Hamstrings

The biceps femoris also**

Answer 26

laterally rotates the leg

Question 27

􀁸 the body may compensate by changing the position of the pelvic bone
􀁸 this can place stress on other muscles in the area and may compress spinal nerves

Answer 27

Weak or Tight Hamstrings