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Body Atlas, Muscle Reference

Muscles

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

118 muscles

118 muscles in Head & Skull Clear ×

Muscle Occipitofrontalis musculus occipitofrontalis Head & Skull The occipitofrontalis is the complete epicranial muscle, consisting of the frontal belly (frontalis) anteriorly and the… Muscle Orbicularis Oculi musculus orbicularis oculi Head & Skull The orbicularis oculi is the sphincter muscle of the eyelid, forming an elliptical ring around the… Muscle Orbicularis Oculi Lacrimal Part pars lacrimalis m. orbicularis oculi Head & Skull The lacrimal part (Horner's muscle) wraps around the lacrimal canaliculi and sac, creating a pumping action… Muscle Orbicularis Oculi Orbital Part pars orbitalis m. orbicularis oculi Head & Skull The orbital part forms the outer elliptical band responsible for forced eye closure. Unlike the palpebral… Muscle Orbicularis Oculi Palpebral Head musculus orbicularis oculi — pars palpebralis Head & Skull The palpebral portion of the orbicularis oculi occupies the eyelids and is responsible for blinking and… Muscle Orbicularis Oculi Palpebral Part pars palpebralis m. orbicularis oculi Head & Skull The palpebral part of orbicularis oculi produces the gentle, involuntary blink. Unlike the orbital part (forceful… Muscle Orbicularis Oris musculus orbicularis oris Head & Skull The orbicularis oris is a complex elliptical muscle surrounding the mouth, built from contributions of the… Muscle Orbicularis Oris (Full) musculus orbicularis oris Head & Skull The orbicularis oris is the lip sphincter, formed by interlacing fibres from the surrounding facial muscles… Muscle Orbicularis Oris Labial Part pars labialis m. orbicularis oris Head & Skull The labial part constitutes the main body of the orbicularis oris, responsible for lip closure and… Muscle Orbicularis Oris Marginal Part pars marginalis m. orbicularis oris Head & Skull The marginal part consists of the fibres immediately adjacent to the vermilion border, responsible for eversion… Muscle Palatoglossus musculus palatoglossus Head & Skull The palatoglossus forms the palatoglossal arch (anterior pillar of the fauces) and is the only tongue… Muscle Palatopharyngeus musculus palatopharyngeus Head & Skull The palatopharyngeus forms the palatopharyngeal arch (posterior pillar of the fauces) and connects the soft palate… Muscle Posterior Cricoarytenoid Detail musculus cricoarytenoideus posterior detail Head & Skull The posterior cricoarytenoid is the only muscle that opens the vocal folds, making it the most… Muscle Procerus musculus procerus Head & Skull The procerus is a small pyramidal muscle at the bridge of the nose that pulls the… Muscle Procerus Detail musculus procerus detail Head & Skull The procerus produces horizontal wrinkles at the nasal root and depresses the medial brow. It is… Muscle Pterygostapedius musculus pterygostapedius Head & Skull The pterygostapedius is a rare accessory muscle of the middle ear, variably connecting the pterygoid region… Muscle Risorius musculus risorius Head & Skull The risorius is a variable and inconsistent muscle present in approximately 50 percent of people, pulling… Muscle Risorius Detail musculus risorius detail Head & Skull The risorius is a variable muscle — it may be absent, single, or multiple on each… Muscle Salpingopharyngeus musculus salpingopharyngeus Head & Skull The salpingopharyngeus is a small muscle arising from the pharyngeal end of the Eustachian tube (salpinx… Muscle Semispinalis Capitis (Full) musculus semispinalis capitis Head & Skull The semispinalis capitis is the largest and most superficial posterior cervical muscle, forming the bulk of… Muscle Sphincter Pupillae musculus sphincter pupillae Head & Skull The sphincter pupillae is a circular smooth muscle ring 0.75 mm wide situated in the posterior… Muscle Spinalis Capitis musculus spinalis capitis Head & Skull Spinalis capitis is the cranial extension of the spinalis column, often blending with semispinalis capitis. It… Muscle Splenius Capitis (Full) musculus splenius capitis Head & Skull The splenius capitis is the superficial posterior cervical muscle running diagonally from the nuchal ligament to… Muscle Stapedius musculus stapedius Head & Skull The stapedius is the smallest named muscle in the human body, measuring approximately 1 millimetre in…