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Body Atlas, Muscle Reference

Muscles

Complete muscle reference, origins, insertions, nerve supply, actions, clinical notes, and common injuries.

676 muscles

676 muscles

Muscle Longissimus Thoracis musculus longissimus thoracis Chest The longissimus thoracis is the largest component of the erector spinae and the primary extensor of… Muscle Longissimus Thoracis Detail musculus longissimus thoracis detail Lower Back Longissimus thoracis is the largest muscle in the body by length, spanning from the pelvis to… Muscle Longus Capitis musculus longus capitis Neck The longus capitis is the deepest flexor of the upper cervical spine and head, connecting the… Muscle Longus Capitis Detail musculus longus capitis Neck Longus capitis is the uppermost of the deep cervical flexors, originating from the C3-C6 transverse processes… Muscle Longus Colli musculus longus colli Neck The longus colli is the primary prevertebral muscle of the anterior cervical spine, lying directly on… Muscle Longus Colli (Full) musculus longus colli Neck The longus colli is the primary deep cervical flexor, lying directly on the anterior vertebral bodies.… Muscle Longus Colli Detail musculus longus colli Neck Longus colli is the largest deep cervical flexor, lying directly on the anterior vertebral bodies from… Muscle Longus Colli Inferior Oblique Fibers pars obliqua inferior m. longi colli Neck The inferior oblique fibres connect the upper thoracic vertebral bodies to the lower cervical transverse processes,… Muscle Longus Colli Superior Oblique Fibers pars obliqua superior m. longi colli Neck The superior oblique fibres of longus colli connect the mid-cervical transverse processes to the atlas, producing… Muscle Longus Colli Vertical Part pars verticalis m. longi colli Neck The vertical part is the central and largest component of longus colli, providing pure cervical flexion.… Muscle Lower Esophageal Sphincter musculus sphincter oesophagi inferior Abdomen The lower esophageal sphincter (LES) is a functional sphincter formed by the intrinsic circular smooth muscle… Muscle Lower Trapezius musculus trapezius — pars inferior Chest The lower trapezius is the inferior portion of the trapezius muscle, characterised by its oblique upward… Muscle Lumbricals (Foot) musculi lumbricales pedis Foot & Ankle The four foot lumbricals arise from the FDL tendons and insert into the lateral toe extensor… Muscle Lumbricals (Hand) musculi lumbricales manus Hand & Wrist The four lumbricals are unique muscles that originate from tendons (the FDP tendons) rather than bone… Muscle Lumbricals Foot Detail musculi lumbricales pedis detail Foot & Ankle The foot lumbricals (four in total) act like those of the hand — they flex the… Muscle Masseter musculus masseter Head & Skull The masseter is the most powerful jaw-closing muscle per unit cross-sectional area in the body, capable… Muscle Masseter (Full) musculus masseter Head & Skull The masseter is the most powerful jaw closing muscle, generating bite forces of 700-800 N at… Muscle Masseter Deep Head caput profundum m. masseteris Head & Skull The deep head of the masseter is smaller and more vertically oriented than the superficial head,… Muscle Masseter Superficial Head caput superficiale m. masseteris Head & Skull The superficial head is the larger component of the masseter, providing the dominant jaw-closing force. Its… Muscle Medial Head of Triceps musculus triceps brachii caput mediale Upper Arm The medial head of the triceps is the deepest and smallest head, arising from the posterior… Muscle Medial Head of Triceps Detail caput mediale m. tricipitis brachii detail Upper Arm The medial head is the most deeply placed and most consistently active of the three triceps… Muscle Medial Pterygoid musculus pterygoideus medialis Head & Skull The medial pterygoid is a thick, quadrilateral muscle forming the medial sling of the temporomandibular joint… Muscle Medial Pterygoid Deep Head caput profundum m. pterygoidei medialis Head & Skull The deep head is the larger medial pterygoid component, arising from the medial pterygoid plate. It… Muscle Medial Pterygoid Superficial Head caput superficiale m. pterygoidei medialis Head & Skull The superficial head of the medial pterygoid arises from the maxillary tuberosity and forms the lateral…

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