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Lecture 11

ANAT 101 Lecture 11: CH 11 Anatomy Origin and Insertion
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7 Pages
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Department
Anatomy
Course Code
ANAT 101
Professor
Michael Bruneau

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Description
C H 11 Anatomy Origin and Insertion Orbit and Nose Muscles - Orbicularis oculi o Origin: medial orbital margin o Insertion: lateral aspect of head or circular path around orbit o Action: closes eye - Nasalis o Origin: maxilla o Insertion: aponeurosis / bridge of nose Scalp Muslces - Occipitofrontals o Two parts: frontal belly and occipital belly  Frontal belly  Origin: epicranial aponeurosis  Insertion: skin of eyebrows  Action: elevation of eyebrows  Occipital belly  Origin: epicranial aponeurosis  Insertion: epicranial aponeurosis  Action: tense and retract scalp - Temporalis o Origin: fascia of temporal bone o Insert: mandible o Action: elevates mandible - Epicranial Aponeurosis o Origin: frontalis muscle o Sheet of connective tissue Mouth Muscle - Orbicularis Oris o Origin: upper lip maxillary bone part of mandible o Insertion: later portion of lip o Action: closes mouth - Masseter o Origin: zygomatic bone of cheek o Insertion: mandible o Action: pull of attachment point on mandible to chew - Depressor anguli oris o Origin: mandible o Insertion: orbicularis oris muscle on mouth o Action: pulls muscle laterally Neck Muscles - Omohyoid o Origin: scapula o Insertion: hyoid bone (inferior border) o Action: depresses hyoid bone - Sternohyoid o Origin: sternum o Insertion: hyoid o Action: pull down, depresses hyoid - Platysma o Origin: pec major and deltoid muscle o Insertion: lower portion of mandible o Action: open mouth and tenses skin of neck - Sternocleidomastoid origin o Origin: sternum and clavicle o Insertion: mastoid process o Action: contralateral rotation (turn head left = right contraction) - Scalenes o Origin: transverse process of cervical vertebrae o Insertion: first and second rib o Action: elevate rib during forced inspiration Shoulder and Chest Muscles - Trapezius o Origin: occipital bone and the ligament of nuche o Insertion: clavicle (trap 1), fossa of scapula (2), lateral margin of scapula (3) o Action: shrug (1), retraction (2), lateral adduction pulldown (3) - Deltoid o Origin: clavicle, lateral portion of acromium, posterior portion of scapula o Insert: humerus o Action: abduction (away), forward and lateral flex, scapula retraction, internal/external rotation - Pec Major o Origin: sternum and clavicle o Insert: humerus o Action: adduction (pull in) - Splenius capitis o Origin: inferior cervical and vertebrae o Insertion: mastoid process o Action: ipsilateral rotation - Teres major o Origin: scapula o Insertion: posterior side of humerus o Action: adduction of humerus and internal rotation - Serratus Anterior o Origin: ribs 1-9 o Insertion: scapula o Action: external rotation of scapula and protraction (punching) Arm Muscles - Bicep Brachii o Origin: scapula o Insertion: radius o Action: elbow flexion - Brachialis o Origin: humerus o Insertion: ulna (coronoid process) o Action: elbow flexor - Triceps brachii o Origin: scapula o Insertion: ulna o Action: extension of the elbow - Pronator teres o Origin: humerus o Insertion: radius o Action: Pronation of forearm - Brachioradialis o Origin: humerus o Insertion: radius o Action: synergist for the bicep brachii in elbow flexion - Flexor carpi radialis o Origin: medial humerus (extensors are lateral) o Insertion: palmer surface of 2 and 3 base of metacarpals o Action: wrist flexion - Flexor digitorum superficialis o Origin: medial humerus o Insertion: middle phalange bone of digits 2-5 o Action: finger flexion - Flexor carpi ulnaris o Origin: medial humerus o Insertion: base of the 5 metacarpal and hook of hamate bone (wrist) o Action: wrist flexion Rotator Cuff Muscles (SITS) - Supraspinatus: o Origin: scapula o Insertion: humerus o Action: abduction of arm - Infraspinatus o Origin: fossa of scapula o Insertion: humerus o Action: external rotation of arm - Teres Minor o Origin: lateral margin of scapula o Insertion: humerus o Action: external rotation of arm and abduction of arm - Subscapularis o Origin: scapula o Insertion: humer
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