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Functions of Muscles
Major muscles and their function
| MUSCLE | FUNCTION |
|---|---|
| orbicularis oris | compresses purses lips/draws lip together (kiss)ENCIRCLES THE MOUTH |
| orbicularis oculi | closes eyelid/ PROTECTS FROM INTENSE LIGHT. BLINKING, SQUINTING. MUSCLES OF THE EYELIDSthe area of blackeye is the muscle |
| frontalis | raises eyebrow/ move scalp forward & backward |
| zygomaticus | minor:retracts and elevates upper lip, major: retracts and elevates corners of mouth...SMILE MUSCLE |
| occipitalis (epicranious- occipitofrontalis) | tenses and retracts scalp raises the eyebrow ( as if in surprise |
| sternocleidomastoid | together: flex neck, alone: bends head toward shoulder turns face to opp. side O-MANIBRIUM AND CLAVICLE (MEDIAL PORTION) I- SUPERIOR NACHAL LINE OF OCCIPITAL BONE |
| rectus abdominis | depresses ribs, flexes vertebral column |
| transverse abdominis | compresses abdominal contents |
| Temporalis | Elevates mandible, AND SIDE TO SIDE MOVEMENT I-CORONOID PROCESS OF MANDIBLE VIA LIGAMENT 0-TEMPRORAL FOSSA |
| serratus anterior | protracts shoulder, rotates scapula so glenoid cavity moves superiorly |
| pectoralis major | flexion, adduction, medial rotation at shoulder |
| latissimus dorsi | extension, adduction and medial rotation at shoulder |
| deltoid | whole: abduction at shoulder, anterior: flexion and medial rotation, posterior: extension and lateral rotation |
| mentalis | elevates and protrudes lower lip |
| triceps brachii | extension at elbow, long head: extension and adduction at shoulder |
| biceps brachii | flexion at elbow and shoulder, supination at elbow |
| brachialis | flexion at elbow |
| supinator | supination |
| diaphragm | contraction expands thoracic cavity compreses abdominopelvic cavity |
| internal intercostals | elevate ribs |
| external intercostals | depresses ribs |
| Buccinator | compresses cheeks/ use when whistling, sucking,blow bubbles. Holds food between teeth when chewing |
| platysma | draws mouth downward/pull skin over clevicle up |
| splenius capitis | together: extend neck, each rotates and laterally flexes neck to that side |
| semispinalis capitis | together: extend head each extends and laterally flexes neck |
| iliocostalic cervicis | extends or laterally flexes neck, elevates ribs |
| iliocostalis thoracis | stabilizes thoracec vertebrae in extension |
| iliocostalis lumborum | extends vertebral column and depresses ribs |
| longissimus capitus | together: extends neck, each rotates and laterally flexes neck to that side |
| longissimus cervicis | together: extends neck, each rotates and laterally flexes neck to that side |
| masseter TEMPORALIS *PRIME MOVERS OF THE MANDIBLE | closes jaw, chewing,ELEVATION MAINTAINS POSITION OF JAW @REST, ELEVATES |
| longissimus thoracis | extends vertebral column, each produces lateral flextion to that side |
| spinalis cervicis | extends neck |
| sternocleidomastoid | together: flex neck, alone: bends head toward shoulder turns face to opp side |
| pectoralis minor | depresses and protracts shoulder, rotates scapula so glenoid cavity moves inferiorly. |
| brachioradialis | flexion at elbow |
| internal oblique | tenses abdominal wall and compresses abdominal contents |
| trapezius | extends head, raises, rotates and retracts scapula and stabilizes it. |
| external oblique | compresses abs, depresses ribs, flexes/bends spine |
| rhomboids | Adducts scapula and downward rotation |
| teres minor | lateral rotation @ shoulder |
| teres major | extension, adduction and medial rotation at shoulder |
| infraspinatus | lateral rotation at shoulder |
| supraspinatus | abduction at shoulder |
| subscapularis | medial rotation at shoulder |
| pronator teres | pronation |
| supinator | supination |
| risorius | draws corners of mouth to side/make fish face |
| depressor anguli oris | depresses lower lip |
| Zygomaticus Major | draws mouth upward / smile muscle |
| Depressor labii inferioris | allow lips to pull downward / frown muscle |
| Medial Pterygoid | assist mandible in chewing |
| Longus Colli | bend neck forward |
| Longu Capitis | flexs-rotate the head |
| Scalenus Anterior SUPERIOR AND POSTERIOR | ELEVATES FIRST 2 RIBS (AIDS RESPIRATION) FLEXES AND ROTATES NECK |
| Scalenus Medias | rasies the 1st rib |
| Scalenus Posterior | bend cervical vertebrae, raises 2nd rib |
| Nasalis | helps open and close nasal |
| Corrugator Supercilii | move eyebrow up and down |
| SPLENIS ( BAND-AID ) | BEARS MOST OF RESPONSIBILITY IN EXTENSION AND HYPER-EXTENSION OF THE NECK, UNILATERALLY ROTATES, LATERALLY FLEXION SAME SIDE |
Created by:
romaniam
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