Thigh muscles: Posterior group

Muscles of the thigh: Posterior groupAnatomy, function, blood supply and innervation of muscles of the thigh
~ 3 min

In this pdf-note, we’ll start with the borders of the lower limb:

  • The posterior border passes through the coccyx and the lateral margins of the sacrum

  • The lateral border is the iliac crest

  • The anterior border passes through the inguinal ligament and the pubic symphysis

Borders of the lower limb
Borders of the lower limb
Borders of the lower limb
Borders of the lower limb

There are several regions within the lower limb:

  1. Gluteal region (regio glutealis)

  2. Femoral region (regio femoralis)

  3. Knee region (regio genus)

  4. Leg region (regio cruralis)

  5. Ankle region (regio talocruralis)

  6. Foot region (regio pedis)

Regions within the lower limb
Regions within the lower limb
Regions within the lower limb
Regions within the lower limb

Within these areas, the muscles of the lower limb are located.

These include:

  • Pelvic girdle muscles

  • Muscles of the free part of lower limb

    The muscles of the free part of the lower limb are divided into:

  • Thigh muscles

  • Leg muscles

  • Foot muscles

    The thigh muscles form three groups:

  • The anterior group consists of the thigh flexors and the leg extensors

  • The posterior group consists of the thigh extensors and the leg flexors

  • The medial group consists of the thigh adductor muscles The posterior group includes the following muscles:

  • Biceps femoris muscle (m. biceps femoris). It consists of two heads: long and short.

    Biceps femoris muscle – long head (m. biceps femoris (caput longum)
    Biceps femoris muscle – long head (m. biceps femoris (caput longum)
    Biceps femoris muscle – short head (m. biceps femoris (caput breve)
    Biceps femoris muscle – short head (m. biceps femoris (caput breve)
    Biceps femoris muscle (m. biceps femoris)
    Biceps femoris muscle (m. biceps femoris)
    Biceps femoris muscle (m. biceps femoris)
    Biceps femoris muscle (m. biceps femoris)
    Biceps femoris muscle
    (m. biceps femoris)

    Origin:

    Long head (caput longum) consists of the ischial tuberosity and the sacrotuberous ligament

    Short head (caput breve) consists of the lateral lip of the linea aspera and the lateral epicondyle of the femur

    Insertion: head of the fibula, lateral condyle of the tibia

    Function: extends the thigh at the hip joint, adducts the thigh, flexes the leg at the knee joint

    Innervation: tibial nerve (S1-S2) innervates the long head, common fibular nerve (L4-S1) innervates the short head

    Blood supply: medial circumflex femoral artery, perforating arteries

  • Semitendinosus muscle (m. semitendinosus)

    Semitendinosus muscle (m. semitendinosus)
    Semitendinosus muscle (m. semitendinosus)
    Semitendinosus muscle (m. semitendinosus)
    Semitendinosus muscle (m. semitendinosus)
    Semitendinosus muscle (m. semitendinosus)
    Semitendinosus muscle (m. semitendinosus)
    Semitendinosus muscle
    (m. semitendinosus)

    Origin: ischial tuberosity, sacrotuberous ligament

    Insertion: tibial tuberosity. Together with the tendons of the sartorius and gracilis muscles, it forms pes anserinus superficialis (pes anserinus superficialis

    Function: extends the hip at the hip joint, pronates the flexed leg

    Innervation: tibial nerve (L4-S2)

    Blood supply: perforating arteries

  • Semimembranosus muscle (m. semimembranosus)

Semimembranosus muscle (m. semimembranosus)
Semimembranosus muscle (m. semimembranosus)
Semimembranosus muscle (m. semimembranosus)
Semimembranosus muscle (m. semimembranosus)
Semimembranosus muscle (m. semimembranosus)
Semimembranosus muscle (m. semimembranosus)
Semimembranosus muscle (m. semimembranosus)
Semimembranosus muscle (m. semimembranosus)
Semimembranosus muscle
(m. semimembranosus)

Origin: ischial tuberosity, sacrotuberous ligament

Insertion: tendon of the muscle is divided into three bundles: medial, middle, and lateral. These bundles together are called pes anserinus profundus (pes anserinus profundus). The medial and middle bundles insert into the medial condyle of the tibia, and the lateral one continues into the oblique popliteal ligament

Function: extends the thigh at the hip joint, pronates the flexed leg, flexes the leg at the knee joint

Innervation: tibial nerve (L4-S1)

Blood supply: medial circumflex femoral artery, perforating arteries, popliteal artery

Dictionary

Muscles of the thigh

Gluteal region
regio glutealis
Femoral region
regio femoralis
Knee region
regio genus
Leg region
regio cruralis
Ankle region
regio talocruralis
Foot region
regio pedis
Biceps femoris muscle
m. biceps femoris
Semitendinosus muscle
m. semitendinosus
Semimembranosus muscle
m. semimembranosus
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