MUSCLES OF LOWER LIMB

Watch the Muscles of the Lower Limb podcast (on the A215 website) PRIOR to coming to lecture. Be sure to take notes from the podcast, as this material will not be repeated in class. Also watch all videos mentioned in the podcast and assigned on the McGraw-Hill website.

I. THIGH MUSCLES (fig 12.16)


    A. Anterior Compartment (Fig. 12.17)

        * those that flex the hip (coxal) joint/thigh:
            1. Iliacus:

            2. Psoas Major:

            3. Sartorius: also flexes knee joint/leg

        * those that extend the knee joint/leg:

            4. Quadriceps Femoris:
                a. Rectus Femoris
                b. Vastus Medialis
                c. Vastus Intermedius
                d. Vastus Lateralis
 

    B. Medial Compartment - adduct the thigh and flex hip joint/thigh (fig 12.15a)
        1. Adductors (Longus, Brevis, Magnus)

        2. Pectineus

        3. Gracilis: also flexes knee joint/LEG
 

    C. Lateral Compartment - abducts thigh (fig 12.15b)

        1. Tensor Fasciae Latae: connects to the iliotibial tract (iliotibial band, fascia lata)
 

    D. Posterior Compartment

        * Gluteal muscles (fig 12.15c)
            1. Gluteus Maximus: extends hip joint/thigh

            2. Gluteus Medius: abducts thigh

            3. Gluteus Minimus: abducts thigh
 

        * "Hamstring" muscles: all extend the hip joint/thigh and flex the knee joint/leg (fig 12.18)

            4. Biceps Femoris

            5. Semitendinosus

            6. Semimembranosus
 

II. LEG MUSCLES (fig. 12.19)


    A. Anterior Compartment (fig 12.20)
        -- all dorsiflex the ankle joint/foot

            1. Tibialis Anterior: also inverts foot

            2. Extensor Digitorum Longus: also extends toes 2-5

            3. Extensor Hallucis Longus: also extends big toe

    B. Lateral Compartment (fig 12.21)
        -- plantar flex ankle joint/foot and evert foot

            1. Fibularis Longus

            2. Fibularis Brevis

    C. Posterior Compartment (fig. 12.22)

        Superficial Group
            -- will plantar flex the ankle joint/foot
            1. Gastrocnemius: also flexes knee joint/leg

            2. Soleus

            3. Plantaris: also flexes knee joint/leg

        Deep Group
            4. Popliteus: flexes knee joint/leg

            5. Flexor Hallucis Longus: plantar flexes ankle joint/foot and flexes the big toe

            6. Flexor Digitorum Longus: plantar flexes ankle joint/foot and flexes toes 2-5

            7. Tibialis Posterior: plantar flexes ankle joint/foot and inverts foot
 

III. FOOT MUSCLES
    A. Dorsum of foot (fig 12.20a)

        1. Extensor Digitorum Brevis: extends toes 2-4

        2. Extensor Hallucis Brevis: extends big toe

    B. Plantar side (sole) of foot (fig 12.23)

 

REVIEW AND REGROUP SOME OF THESE MUSCLES ACCORDING TO
COMMON FUNCTION WITH THE  MUSCLES OF LOWER LIMB MEMORY MATRIX .

 

The muscles in the anterior compartment of the LEG perform this common function:

a.  plantar flex the ankle joint/foot

b.  flex the toes

c.  evert the foot

d.  dorsiflex the ankle joint/foot

e.  flex the knee joint/leg

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