Procedure Imuscles Of The Hip And Hindlimb

1. Place the fetal pig in the dissecting tray with its ventral side up.

2. Remove any remaining fat and connective tissue from the hip and hindlimb to expose the muscles.

3. Study figure 24.9, and then locate and dissect the following muscles from the medial surface of the thigh:

sartorius gracilis

4. Using scissors, transect the sartorius and gracilis, and lift aside their cut edges to observe the deeper muscles of the thigh.

5. Study figure 24.9, and then locate and dissect the following muscles:

tensor fasciae latae rectus femoris vastus medialis adductor group semimembranosus semitendinosus

6. Transect the tensor fasciae latae and rectus femoris muscles and turn their ends aside. Locate the vastus intermedius and vastus lateralis muscles beneath. (Note: In some specimens, the vastus intermedius, vastus lateralis, and vastus medialis

Figure 24.9 Medial superficial and deep muscles of the hindlimb, ventral view.

Sartorius Gracilis

External oblique Rectus abdominis Tensor fasciae latae Rectus femoris Vastus medialis

Gracilis (cut)

Gracilis (cut) Adductor group Semimembranosus

Gastrocnemius Tibialis anterior

Ctir/

Semitendinosus

Table 24.5 Muscles of the Forelimb

Muscle

Origin

Insertion

Action

Triceps brachii

Lateral head

Deltoid tuberosity of humerus

Olecranon process of ulna

Extends forelimb

Long head

Border of glenoid cavity of scapula

Olecranon process of ulna

Extends forelimb

Medial head

Shaft of humerus

Olecranon process of ulna

Extends forelimb

Brachialis

Lateral surface of humerus

Proximal end of ulna

Flexes forelimb

Biceps brachii

Scapula

Radius and ulna

Flexes forelimb

Extensor carpi ulnaris

Lateral epicondyle of humerus

Fifth metacarpal

Extends wrist

Extensor digitorum lateralis

Distal end of humerus

Digits

Extends digits

Extensor digitorum communis

Lateral surface of humerus

Digits

Extends digits

Extensor carpi radialis

Distal end of humerus

Distal end of radius

Rotates foot

Flexor carpi ulnaris

Medial epicondyle of humerus

Carpals

Flexes wrist

Flexor digitorum superficialis

Medial epicondyle of humerus

Distal phalanges

Flexes digits

Flexor digitorum profundus

Medial epicondyle of humerus

Distal phalanges

Flexes digits

Flexor carpi radialis

Medial epicondyle of humerus

Metacarpals

Flexes metacarpals

muscles are closely united by connective tissue and are difficult to separate.) 7. Study figure 24.10, and then locate and dissect the following muscles from the lateral surface of the hip and thigh:

biceps femoris gluteus superficialis (gluteus maximus) gluteus medius

8. Using scissors, transect the tensor fasciae latae and biceps femoris, and lift aside their cut edges to observe the deeper muscles of the thigh.

9. On the lateral surface of the leg (see fig. 24.10), locate and dissect the following muscles:

gastrocnemius soleus extensor digitorum longus

Figure 24.10 Muscles of the hip, thigh, and leg, lateral view.

Gluteus superficialis (gluteus maximus)

Tensor fasciae latae

Vastus lateralis Biceps femoris Semitendinosus Semimembranosus

Gastrocnemius Soleus

Figure 24.10 Muscles of the hip, thigh, and leg, lateral view.

Gluteus superficialis (gluteus maximus)

Tensor fasciae latae

Human Tensor Fascia Latae

Extensor digitorum longus

Peroneus group

- Tibialis anterior

Extensor digitorum longus

Peroneus group

- Tibialis anterior tibialis anterior peroneus group

10. See table 24.6 for the origins, insertions, and actions of these muscles of the hip and hindlimb.

11. Complete Part E of the laboratory report.

Table 24.6 Muscles of the Hip and Hindlimb

Muscle

Origin

Insertion

Action

Tensor fasciae latae

Iliac crest

Fascia lata of thigh

Tighten fascia lata

Gluteus superficialis

Sacral and caudal vertebrae

Greater trochanter of femur

Abducts thigh

Gluteus medius

Ilium

Greater trochanter of femur

Abducts thigh

Quadriceps femoris

Vastus lateralis

Shaft of femur and greater trochanter

Patella

Extends hindlimb

Vastus intermedius

Shaft of femur

Patella

Extends hindlimb

Rectus femoris

Ilium

Patella

Extends hindlimb

Vastus medialis

Shaft of femur

Patella

Extends hindlimb

Hamstring muscles

Biceps femoris

Ischium

Tibia

Abducts thigh and flexes lower hindlimb

Semimembranosus

Ischium

Tibia

Flexes lower hindlimb

Semitendinosus

Ischium

Tibia

Flexes lower hindlimb

Sartorius

Crest of ilium

Proximal end of tibia

Adducts thigh

Gracilis

Pubis

Proximal end of tibia

Adducts hindlimb

Adductor group

Pubis

Femur

Adducts hindlimb

Gastrocnemius

Lateral and medial epicondyles of femur

Calcaneus

Extends foot

Soleus

Proximal end of fibula

Calcaneus

Extends foot

Tibialis anterior

Proximal end of tibia

Second metatarsal

Flexes foot

Peroneus group

Shaft of tibia and fibula

Metatarsals

Flexes foot

Extensor digitorum longus

Proximal end of tibia and fibula

Digits

Extends digits

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