Human Movement Science & Functional Anatomy of the:

Biceps Femoris (Lateral Hamstring)

by Brent Brookbush DPT, PT, COMT, MS, PES, CES, CSCS, ACSM H/FS

Biceps Femoris by Gray's Anatomy - 20th Edition via

What’s in a name

  • biceps 1630s (adj.), from Latin biceps “having two parts,” literally “two-headed,” frombis“double” (see bis-) + -ceps comb. form of caput “head” (see capitulum). As a noun meaning “biceps muscle,” from 1640s, so called for its structure. Despite the -s, it is singular, and classicists insist there is no such word as bicep. (Etymology Online)
  • femur (n.) 1560s, from Latin femur “thigh, upper part of the thigh,” which is of unknown origin. (Etymology Online)

    • "Two headed muscles on the femur"

Cross-section of the Thigh (Note the Biceps Femoris at the bottom of the picture) -

Biceps Femoris

  • Origin:

    • Long Head: Distal part of the sacrotuberous ligament and posterior part of the tuberosity of the ischium sharing a common tendon with the semitendinosus (8, 11, 22).
    • Short Head: Lateral lip of the linea aspera, proximal 2/3 of the supracondylar line (along with the middle portion of the adductor magnus), and Lateral intermuscular septum (8, 11).

  • Insertion: The long head and short head of the biceps femoris share a common tendon that inserts on the lateral side of the head of the fibula, lateral condyle of the tibia, and deep fascia on the lateral side of the lower leg (8, 11, 23).
  • Nerve:

    • Long Head: Tibial nerve; a branch of the sciatic nerve via the sacral plexus, originating from