System: Musculoskeletal

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

Pisiform Bone

Pisiform Bone The structure indicated is the pisiform bone of the hand. There are three groups of bones in the hand: Carpal bones (8 in total) Metacarpal bones Phalanges The carpal bones are separated into two rows: Proximal row Distal row The pisiform bone is one of four bones in the proximal row of carpals (scaphoid, lunate, triquetral, pisiform). The pisiform bone is a tiny sesamoid bone located in the tendon of the flexor carpi ulnaris muscle. It articulates with the palmar surface of the triquetral bone. Learn more about the anatomy of the bones of the hand in this …

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Pisiform bone

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

First Metatarsal

First Metatarsal The structure indicated is the first metatarsal bone of the foot. The foot contains three groups of bones: Tarsals Metatarsals Phalanges There are 7 tarsal bones, and 5 metatarsals. The metatarsals are numbered from 1 to 5 from medial to lateral, with the first metatarsal belonging to that of the great toe (hallux) and the 5th metatarsal belonging to that of the little toe. The metatarsals consist of the following parts: Base Shaft Head Learn more about the anatomy of the bones of the foot in this anatomy tutorial.
first metatarsal

Talus

Talus The structure indicated is the talus bone of the foot. The foot contains three groups of bones: Tarsals Metatarsals Phalanges The talus is one of seven tarsal bones. There are three groups of tarsal bones: Proximal group Intermediate group Distal group There are two bones in the proximal group of tarsal bones: the talus and the calcaneus. The calcaneus is the largest tarsal bone and forms the heel through its posterior projection. The talus articulates with the medial malleolus of the tibia and the lateral malleolus of the fibula to form the ankle joint. In addition, it articulates with …

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Talus

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

First Metacarpal

First Metacarpal The structure indicated is the first metacarpal of the hand. There are three groups of bones in the hand: Carpal bones (8 in total) Metacarpal bones Phalanges The carpal bones are separated into two rows: Proximal row Distal row There are 5 metacarpal bones numbered 1 to 5 and are located between the carpal bones and the phalanges. The first metacarpal bone is associated with the thumb, the 5th metacarpal bone is associated with the little finger. The joints between the carpals and the metacarpals are known as carpometacarpal joints. The joints between the metacarpals and the proximal …

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first metacarpal

Cuboid Bone

Cuboid Bone The structure indicated is the cuboid bone of the foot. The foot contains three groups of bones: Tarsals Metatarsals Phalanges The cuboid bone is one of seven tarsal bones. There are three groups of tarsal bones: Proximal group Intermediate group Distal group The cuboid bone belongs to the distal group of tarsal bones. There are four bones in the distal group: Lateral cuneiform Intermediate cuneiform Medial cuneiform Cuboid The cuboid bone is the most lateral bone in the distal row of tarsal bones, it is named on the basis of its shape which roughly resembles a cube. The …

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cuboid bone