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Lecture 11

ANAT 101 Lecture Notes - Lecture 11: Iliotibial Tract, Tensor Fasciae Latae Muscle, Iliacus MusclePremium

7 pages73 viewsFall 2016

Department
Anatomy
Course Code
ANAT 101
Professor
Michael Bruneau
Lecture
11

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CH 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)
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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
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