Muscles

Gemellus Superior

Gemellus Superior The structure indicated is the gemellus superior. The gemellus superior 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 word gemellus comes from the Latin “gemelli” which means “twins”. There are therefore two gemelli muscles, the gemellus superior, and the gemellus inferior. The gemelli muscles are located either …

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superior gemellus

Fibularis Brevis

Fibularis Brevis The structure indicated is the fibularis (peroneus) brevis muscle. The fibularis brevis muscle is one of the muscles of the lateral compartment of the leg. The leg consists of three muscular compartments: anterior, posterior and lateral. The lateral compartment consists of two muscles: Fibularis (peroneus) longus Fibularis (peroneus) brevis The lateral muscles are responsible for eversion of the foot and are innervated by the superficial fibular (peroneal) nerve, which is a branch of the common fibular nerve. The common fibular nerve is a branch of the sciatic nerve and divides into the superficial fibular nerve and the deep …

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fibularis brevis

Extensor Pollicis Longus

Extensor Pollicis Longus The structure indicated is the extensor pollicis longus muscle of the posterior forearm. The extensor pollicis longus muscle is one of the muscles located in the deep layer of muscles in the posterior compartment of the forearm. There are 5 muscles in the deep layer of the posterior forearm: Supinator Abductor pollicis longus Extensor pollicis brevis Extensor pollicis longus Extensor indicis The tendon of the extensor pollicis longus forms the medial border of the anatomical snuffbox. The anatomical snuff box is an anatomical triangle located on the dorsal surface of the hand, it consists of the following …

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extensor pollicis longus

Extensor Hallucis Longus

Extensor Hallucis Longus The structure indicated is the extensor hallucis longus muscle. The extensor hallucis longus is one of the four muscles of the anterior compartment of the leg. The muscles of the leg consist of three compartments: Anterior Posterior Lateral In the anterior compartment are the four following muscles: Tibialis anterior Extensor hallucis longus Extensor digitorum longus Fibularis tertius The muscles of the anterior compartment of the leg serve to dorsiflex the ankle joint, extend the toes and invert the foot, and they are supplied by the deep fibular (peroneal) nerve. Origin: Middle half of medial fibula and interosseous …

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extensor hallucis longus

Extensor Digitorum Brevis

 Extensor Digitorum Brevis The structure indicated is the extensor digitorum brevis muscle. This muscle is the only intrinsic muscle of the foot located on the dorsal aspect, and serves to extend digits 2 to 4. Origin: Superolateral calcaneus Insertion: Base of proximal phalanx of great toe, lateral portion of tendons of extensor digitorum longus of toes 2 – 4. Action: Extension of great toe at MTP joint. Flexion of toes 2 – 4. Innervation: Deep fibular nerve. Learn more about the anatomy of the foot muscles in this tutorial.

extensor digitorum brevis

Gluteus Maximus

Gluteus Maximus The structure indicated is the gluteus maximus. The gluteus maximus 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 gluteus maximus muscle is the largest of the gluteal muscles, and is also the largest muscle in the human body. Origin: Posterior surface of ilium, posterior superior iliac crest, …

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gluteus maximus

Gluteus Minimus

Gluteus Minimus The structure indicated is the gluteus minimus. The gluteus minimus 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 Origin: Dorsal ilium between inferior and anterior gluteal lines and edge of greater sciatic notch. Insertion: lateral and superior surfaces of greater trochanter Action: Hip abduction, hip medial rotation (anterior …

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gluteus minimus

Ischiocavernosus

Ischiocavernosus The structure indicated is the ischiocavernosus muscle. The ischiocavernosus muscle is one of three pairs of muscles in the superficial perineal pouch: Ischiocavernosus Bulbospongiosus Superficial transverse perineal muscles It originates from the inner aspect of the ischiopubic ramus and attaches on either side to the crura of the penis and clitoris. Origin: Ischiopubic ramus – internal aspect Insertion: Crus of penis and clitoris Action: Stabilise erect penis Innervation: Pudendal nerve Learn more about the pelvic floor in this tutorial

ischiocavernosus

Extensor Carpi Radialis Brevis

Extensor Carpi Radialis Brevis The structure indicated is the extensor carpi radialis brevis muscle of the forearm. The extensor carpi radialis brevis muscle is one of 7 muscles located in the superficial compartment of the posterior forearm. The posterior forearm consists of a superficial and a deep compartment. The superficial compartment contains 7 muscles, whereas the deep compartment contains 5 muscles. The superficial compartment of the posterior forearm includes the following 7 muscles: Brachioradialis Extensor carpi radialis longus Extensor carpi radialis brevis Extensor digitorum Extensor digiti minimi Extensor carpi ulnaris Anconeus The extensor carpi radialis brevis muscle serves to abduct and extend the wrist joint. The muscles of the …

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extensor carpi radialis brevis

Piriformis

Piriformis The structure indicated is the piriformis muscle. The piriformis 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 gluteal region generally serve to laterally rotate the femur. The piriformis muscle passes through the greater sciatic foramen and divides it into two spaces: Greater sciatic foramen …

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Piriformis