System: Musculoskeletal

Medial Epicondyle of Humerus

Medial Epicondyle of Humerus The structure indicated is the medial epicondyle of the humerus. The distal end of the humerus consists of several features: Condyle, consisting of the capitulum and trochlea Medial and lateral epicondyles Medial and lateral supracondylar ridges Radial fossa, coronoid fossa, olecranon fossa A large central condyle which has two articular components – the capitulum which articulates with the radius, and the trochlea which articulates with the ulna. Either side of the humeral condyle, are two epicondyles, the medial and lateral epicondyles superior to which are the medial and lateral supracondylar ridges. The medial and lateral epicondyles …

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medial epicondyle of humerus

Arcuate Line of Pelvis

Arcuate Line of Pelvis The structure indicated is the arcuate line of the pelvis. The pelvic bones consist of three parts: Ilium Ischium Pubis The arcuate line is found on the medial surface of the ilium. The ilium is the most superiorly positioned bone of the pelvis. The medial surface of the ilium is divided into superior and inferior parts by a ridge – the anterior part of this ridge is known as the arcuate line and forms part of the border of the pelvic inlet. The arcuate line lies below the iliac fossa, and below the iliacus muscle of the …

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arcuate line of pelvis

Greater Sciatic Notch

Greater Sciatic Notch The structure indicated is the greater sciatic notch of the pelvis. The greater sciatic notch les between the ischial spine (inferiorly) and the posterior inferior iliac spine (superiorly). The sacrospinous ligament which attaches from the ischial spine to the lateral aspect of the sacrum and coccyx converts the greater sciatic notch into the greater sciatic foramen. The lesser sciatic notch lies below the ischial spine, and is converted into the lesser sciatic foramen by the sacrospinous and sacrotuberous ligaments. The piriformis muscle passes through the greater sciatic foramen and divides it into two spaces: Greater sciatic foramen …

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greater sciatic notch

Calcaneal (Achilles) Tendon

Calcaneal (Achilles) Tendon The structure indicated is the calcaneal tendon (Achilles’ tendon). The calcaneal tendon is formed from the convergence of the three muscles of the superficial compartment of the posterior leg to form a tendon that inserts onto the calcaneus. The posterior compartment of the leg consists of a superficial group of muscles and a deep group of muscles. 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 The calcaneal tendon is the thickest tendon in the human …

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calcaneal (achilles) tendon

Obturator Externus

Obturator Externus The muscle indicated is the obturator externus muscle. The obturator externus is one of six muscles in the medial compartment of the thigh. The thigh consists of three muscular compartments: Anterior Medial Posterior The medial compartments consists of the following muscles: Gracilis Pectineus Adductor longus Adductor brevis Adductor magnus Obturator externus All the muscles of the medial compartment are innervated by the obturator nerve except for the pectineus (femoral nerve) and the hamstring part of the adductor magnus (tibial division of sciatic). The muscles of the medial compartment generally serve to adduct the thigh at the hip joint. …

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Obturator externus

Adductor Brevis

Adductor Brevis The structure indicated is the adductor brevis muscle. The muscle indicated is the adductor brevis muscle of the thigh. The adductor brevis is one of six muscles in the medial compartment of the thigh. The thigh consists of three muscular compartments: Anterior Medial Posterior The medial compartments consists of the following muscles: Gracilis Pectineus Adductor longus Adductor brevis Adductor magnus Obturator externus All the muscles of the medial compartment are innervated by the obturator nerve except for the pectineus (femoral nerve) and the hamstring part of the adductor magnus (tibial division of sciatic). The muscles of the medial …

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Adductor Brevis

Lesser Trochanter

Lesser Trochanter The structure indicated is the lesser trochanter of the femur. The lesser trochanter is a small protuberance of bone that projects from the posterior aspect of the femur, inferomedially at the base of the femoral neck. Two muscles insert onto the lesser trochanter: Psoas major Iliacus Learn more about the anatomy of the femur in this anatomy tutorial.
lesser trochanter of femur

Proximal Phalanx

Proximal Phalanx The structure indicated is the proximal phalanx of the 5th finger. The hand consists of three groups of bones: Carpals Metacarpals Phalanges The phalanges (phalanx = singular), form the fingers/digits of the hands. The thumb consists of two phalanges: proximal phalanx and distal phalanx. The rest of the fingers consist of: Proximal phalanx Middle phalanx Distal phalanx The phalanges themselves have the following features: Base (proximally) Head (distally) Shaft/body (in between the base and the head) Learn more about the anatomy of the bones of the hand in this tutorial.
proximal phalanx of 5th finger

Adductor Tubercle

Adductor Tubercle The structure indicated is the adductor tubercle of the distal femur. The adductor tubercle is found distally on the femur and is formed from the termination of the medial supracondylar line. The adductor tubercle serves as the point of attachment for the adductor magnus muscle. Learn more about the anatomy of the femur in this tutorial.
adductor tubercle

Adductor Longus

Adductor Longus The muscle indicated is the adductor longus muscle of the thigh. The adductor longus is one of six muscles in the medial compartment of the thigh. The thigh consists of three muscular compartments: Anterior Medial Posterior The medial compartments consists of the following muscles: Gracilis Pectineus Adductor longus Adductor brevis Adductor magnus Obturator externus All the muscles of the medial compartment are innervated by the obturator nerve except for the pectineus (femoral nerve) and the hamstring part of the adductor magnus (tibial division of sciatic). The muscles of the medial compartment generally serve to adduct the thigh at …

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adductor longus