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In anatomy, flexor is a muscle that contracts to perform flexion (from the Latin verb ''flectere'', to bend), a movement that decreases the angle between the bones converging at a joint. For example, one's elbow joint flexes when one brings their hand closer to the shoulder, thus decreasing the angle between the upper arm and the forearm.
The hip flexors are (in descending order of importance to the action of flexing the hip joint):Platzer (2004), p 246
*Collectively known as the iliopsoas or inner hip muscles:
** Psoas major
** Iliacus muscle
* Anterior compartment of thigh
** Rectus femoris (part of the quadriceps muscle group)
** Sartorius
* One of the gluteal muscles:
** Tensor fasciae latae
* Medial compartment of thigh
** Pectineus
** Adductor longus
** Adductor brevis
** Gracilis
Without the iliopsoas muscles, flexion in sitting position is not possible across the horizontal plane.
Foot Articulations
/ref> ** Lumbrical muscle (foot) ** Plantar interossei ** Dorsal interossei
Flexors
Upper limb
*of the humerus bone (the bone in the upper arm) at the shoulder ** Pectoralis major ** Anterior deltoid ** Coracobrachialis ** Biceps brachii * of the forearm at the elbow ** Brachialis ** Brachioradialis ** Biceps brachii *of carpus (the carpal bones) at the wrist ** flexor carpi radialis ** flexor carpi ulnaris ** palmaris longus *of the hand ** flexor pollicis longus muscle ** flexor pollicis brevis muscle ** flexor digitorum profundus muscle ** flexor digitorum superficialis muscleLower limb
Hip
The hip flexors are (in descending order of importance to the action of flexing the hip joint):Platzer (2004), p 246
*Collectively known as the iliopsoas or inner hip muscles:
** Psoas major
** Iliacus muscle
* Anterior compartment of thigh
** Rectus femoris (part of the quadriceps muscle group)
** Sartorius
* One of the gluteal muscles:
** Tensor fasciae latae
* Medial compartment of thigh
** Pectineus
** Adductor longus
** Adductor brevis
** Gracilis
Without the iliopsoas muscles, flexion in sitting position is not possible across the horizontal plane.
Thigh
* of thigh at knee (L5-S2) ** Biceps femoris ** Semitendinosus ** Semimembranosus ** Gracilis ** Sartorius ** Gastrocnemius ** Popliteus ** Plantaris (negligible) * of toes ** Posterior compartment of leg *** Flexor hallucis longus *** Flexor digitorum longus ** Flexor digitorum brevis ** Quadratus plantae ** Flexor hallucis brevis ** Flexor digiti minimi brevis * of proximal phalanges at metatarsophalangeal joint/ref> ** Lumbrical muscle (foot) ** Plantar interossei ** Dorsal interossei
Other
* torso/ lumbar vertebrae ** Rectus abdominis muscle * neck at atlanto-occipital joint ** Longus capitis muscle ** Longus colli muscleSee also
* List of extensors of the human bodyReferences
{{Joints Anatomical terms of motion