Muscles

Quadratus Femoris

Quadratus Femoris The structure indicated is the quadratus femoris muscle. The quadratus femoris muscle is one of the muscles of the gluteal region. The muscles in the gluteal region are divided into a superficial and deep group. There are four muscles of the superficial group: Gluteus maximus Gluteus medius Gluteus minimus Tensor fasciae latae There are 5 muscles in the deep group: Gemellus superior Gemellus inferior Quadratus femoris Piriformis Obturator internus The deep muscles of the thigh are much smaller than the superficial group of muscles and generally serve to laterally rotate the femur at the hip joint. The quadratus …

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quadratus femoris

Dorsal Interossei

Dorsal Interossei The structure indicated is the first dorsal interosseous muscle of the hand. The dorsal interossei belong to the intrinsic group of muscles which act on the hand. The intrinsic muscles include the following muscles/groups: Thenar group (act on thumb) Hypothenar group (act on little finger) Adductor pollicis Lumbricals Interossesus muscles (dorsal and palmar) Palmaris brevis All the intrinsic muscles of the hand, except the thenar muscles and the lateral two lumbrical muscles are innervated by the deep branch of the ulnar nerve. The thenar muscles and the lateral two lumbrical muscles are innervated by the median nerve.  A …

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First dorsal interosseus

Adductor Pollicis

Adductor Pollicis The structure indicated is the adductor pollicis muscle of the hand. The adductor pollicis muscle belong to the intrinsic group of muscles which act on the hand. The intrinsic muscles include the following muscles/groups: Thenar group (act on thumb) Hypothenar group (act on little finger) Adductor pollicis Lumbricals Interossesus muscles (palmar and dorsal interossei) Palmaris brevis All the intrinsic muscles of the hand, except the thenar muscles and the lateral two lumbrical muscles are innervated by the deep branch of the ulnar nerve. The thenar muscles and the lateral two lumbrical muscles are innervated by the median nerve.  …

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adductor pollicis

Flexor Pollicis Brevis

Flexor Pollicis Brevis The structure indicated is the flexor pollicis brevis muscle of the hand. The flexor pollicis brevis muscle is one of the intrinsic muscles of the hand that belongs to the thenar group. The thenar group of intrinsic hand muscles consist of three muscles: Abductor pollicis brevis Flexor pollicis brevis Opponens pollicis All the intrinsic muscles of the hand, except the thenar muscles and the lateral two lumbrical muscles are innervated by the deep branch of the ulnar nerve. The thenar muscles and the lateral two lumbrical muscles are innervated by the median nerve.  A useful mnemonic for …

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flexor pollicis brevis

First Lumbrical

First Lumbrical The structure indicated is the first lumbrical muscle of the hand. The lumbricals belong to the intrinsic group of muscles which act on the hand. The intrinsic muscles include the following muscles/groups: Thenar group (act on thumb) Hypothenar group (act on little finger) Adductor pollicis Lumbricals Interossesus muscles Palmaris brevis All the intrinsic muscles of the hand, except the thenar muscles and the lateral two lumbrical muscles are innervated by the deep branch of the ulnar nerve. The thenar muscles and the lateral two lumbrical muscles are innervated by the median nerve.  A useful mnemonic for remembering this …

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first lumbrical

Opponens Digiti Minimi

Opponens Digiti Minimi The structure indicated is the opponens digiti minimi muscle. The opponens digiti minimi muscle is one of the intrinsic muscles of the hand that belongs to the hypothenar group. The hypothenar group of intrinsic hand muscles consist of three muscles: Abductor digiti minimi Opponens digiti minimi Flexor digit minimi brevis All the intrinsic muscles of the hand, except the thenar muscles and the lateral two lumbrical muscles are innervated by the deep branch of the ulnar nerve. The thenar muscles and the lateral two lumbrical muscles are innervated by the median nerve.  A useful mnemonic for remembering …

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opponens digiti minimi

Rectus Femoris

Rectus Femoris The structure indicated is the rectus femoris of the quadriceps group of thigh muscles. The rectus femoris is one of the muscles that makes up the quadriceps femoris, and is contained in the anterior compartment of the thigh. The muscles of the anterior compartment are all innervated by the femoral nerve and serve generally to extend the leg at the knee joint. The four muscles that make up the quadriceps femoris are the: Rectus femoris Vastus lateralis Vastus medialis Vastus intermedius In addition to the quadriceps muscles, the Sartorius muscle is also located in the anterior compartment together …

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rectus femoris

Tibialis Posterior

Tibialis Posterior The structure indicated is the tibialis posterior muscle of the leg. The muscles of the leg consist of the three compartments: Anterior Posterior Lateral The muscles in the posterior compartment of the leg are separated into a superficial group and a deep group. The superficial group consists of the following leg muscles: Gastrocnemius Plantaris Soleus The deep group consists of the following leg muscles: Popliteus Flexor hallucis longus Flexor digitorum longus Tibialis posterior Generally speaking, the muscles of the posterior compartment serve to plantarflex at the ankle joint, invert the foot and flex the toes. The posterior leg …

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tibialis posterior

Popliteus

Popliteus The structure indicated is the popliteus muscle of the leg. The muscles of the leg consist of the three compartments: Anterior Posterior Lateral The muscles in the posterior compartment of the leg are separated into a superficial group and a deep group. The superficial group consists of the following leg muscles: Gastrocnemius Plantaris Soleus The deep group consists of the following leg muscles: Popliteus Flexor hallucis longus Flexor digitorum longus Tibialis posterior Generally speaking, the muscles of the posterior compartment serve to plantarflex at the ankle joint, invert the foot and flex the toes. The posterior leg muscles are …

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popliteus

Levator Scapulae

Levator Scapulae The structure indicated is the levator scapulae muscle. The levator scapulae muscle is one of the superficial muscles of the back. There are three groups of back mucsles: Superficial Intermediate Deep The superficial group of back muscles consists of 5 muscles: Trapezius Latissimus dorsi Levator scapulae Rhomboid major Rhomboid minor The name “levator scapulae”, is the Latin for “elevator of the scapula”, which describes the function of this muscle. Origin: Transverse processes of cervical vertebrae CI to C4 Insertion: Upper aspect of medial border of scapula Action: Elevates scapula Innervation: Dorsal scapula nerve Learn more about the anatomy …

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levator scapulae