Details Title: A&P Lab Lab 15 Description: Important Muscles I Total Flash Cards: 21 Created: 09/29/2008 07:37:10		New Users: To study from this flashcard set, or to create your own your own study flash cards, REGISTER HERE. Existing Users: CLICK HERE. Additional Physiology Flashcards
Cards in this set: Term Masseter Definition Origin: Zygomatic arch and Maxilla Insertion: Angle and ramus of mandible Action: Close jaw and elevates mandible Term Temporalis Definition Origin: Temporal fossa Insertion: Coronoid process of mandible Action: Close jaw, retracts mandible Term Platysma Definition Origin: Fascia of chest (over pectoral and deltoids). Insertion: Lower margin of mandible, skin, and muscle at corner of mouth. Action: Depresses mandible, pulls lower lip back and down. Term Digastric Definition Origin: Lower margin of mandible (anterior belly( and mastoid process (posterior belly). Insertion: connective tissue loop to hyoid bone. Action: Acting in concert, elevate hyoid bone, open mouth and depress mandible. Term Pectoralis Major Definition Origin:Clavicle, sternum, cartilage of ribs 1-6. Aponeurosis of external oblique muscle. Insertion: Fibers converge to insert by short tendon into the inter tubercular sulcus of humerus. Action: Prime arm flexor adducts, medially roates arm. Arm fixed pulls chest upward (inspiration). Term Serratus Anterior Definition Origin: Lateral aspect of ribs 1-8 Insertion: Vertebral border of anterior surface of scapula. Action: Moves scapula forward toward chest wall. Rotates scapula causing inferior angle to move laterally and upward, abduction and raising of arm. Term Deltoid Definition Origin: Lateral 1/3 of clavicle; acromion and spine of scapula. Insertion: Deltoid tuberosity of humerus Action: Prime mover of arm abduction and raising of arm. Can aid in flexion and extension and rotation of humerus. Term Pectoralis Minor Definition Origin: Anterior surfance of ribs 3-5 near their costal cartilages. Insertion: coracoid process of scapula. Action: With ribs fixed, draws scapula forward and inferior; with scapula fixed draws rib cage superior. Term External Intercostals Definition Origin: Inferior border of rib Insertion: Superior border of rib below. Action: Pulls ribs toward one another to elevate rib cage. Aids in inspiration. Term Internal Intercoastals Definition Origin: Superior border of rib below Insertion Inferior border of rib above Action: Draws ribs together to depress rib cage; aids in forced expiration; antagonistic to external intercoastals. Term Rectus Abdominis Definition Origin:Pubic crest and symphysis Insertion: Xiphoid process and costal cartilages of ribs 5-7 Action: Flexes rotates vertebral column. Increases abdominal pressure, fixes and depresses ribs. Stabilizes pelvis during walking. Term External Oblique Definition Origin: Anterior sufance of last 8 ribs. Insertion: Linea alba, pubic crest and tubercles and iliac crest. Action: Aids in muscles of back in trunk rotation and lateral flexion use in oblique curls. Also jobs of the rectus abdominis. Action: Term Internal Oblique Definition Origin: Lumbar fascia, iliaic crest and the inguinal ligament. Insertion: linia alba, pubic crest, cartilages of last 3 ribs. Action: As for external obliques: Aids in muscles of back in trunk rotation and lateral flexion use in oblique curls. Also jobs of the rectus abdominis. Term Transversus Abdominis Definition Origin: Inguinal ligament, iliac crest, cartilages of last 5-6 ribs, lumbar fasica. Insertion: Linea alba and public crest Action: Compresses abdominal contents. Term Trapezius Definition Origin: Pccipital bone, ligamentum nuchaw, spines of C7 and all thoraic vertebrae. Insertion: Acromion and spinous process of scapula, lateral third of clavicle. Action: Extends head, raises rotates and retracts scapula and stabilizes it, superior fibers elevate scapula, inferior fibers depresses. Term Intraspinatus Definition Origin: Infraspinous fossa of scapula. Insertion: Greater tubercle of humerus Action: lateral rotation of humerus, helps hold head of humerus in glenoid cavity, stabilizes shoulder. Term Teres Minor Definition Origin: :ateral margin of scapula Insertion: Greater tubercle of humerus Action: lateral rotation of humerus, helps hold head of humerus in glenoid cavity, stabilizes shoulder. Term Teres Major Definition Origin: Posterior surface at inferior angle of scapula. Insertion: Intertubercular sulcus of humerus. Action: Extends, medially rotates, and adducts humerus, synergist of latissimus dorsi. Term Supraspinatus Definition Origin: Supraspinous fossa of scapula Insertion: Greater tubercle of humerus Action: Assists abduction of humerus, stabilizes shoulder joint. Term Levator scapulae Definition Origin: Transverse processes of C1-C4 Insertion: Medial border of scpula superior to spine. Action: Elevates and adducts scapular, fixed scapula, flexes neck to the same side. Term Rhomboids Major/Minor Definition Origin: Spinous processes of C7, T1-T5. Insertion: Medial border of scapula Action: Pulls scapula medially stabilizes scapular, rotates glenoid cavity downward.