Anatomy 337 Exam 4- Muscles of the
Upper Extremity Exam |60 Complete Q’s
and A’s
Origin of Muscle - -The fixed attachment of one end of the muscle to a bone
- Insertion of Muscle - -muscle end attached to the bone that moves when
the muscle contracts
- Posterior Muscles of the Pectoral Girdle - -1. Trapezius
2. Deltoid
3. Teres Major
4. Latissimus Dorsi
- Trapezius Muscle - -- Origin: Occipital Bone, cervical and thoracic spinous
processes
- Insertion: Clavicle, acromion process, spine of scapula
- Action:
Superior fibers: Elevate, superiorly rotate
Middle Fibers: Retract scapula (shoulder blades together)
Inferior Fibers: depress scapula
- Innervation: Accessory Nerve (XII)
- Blood Supply: Dorsal Scapular Artery
- Deltoid Muscle - -Origin: Acromial end of clavicle, acromion and spine of
scapula
Insertion: Deltoid tuberosity of humerous
Action:
Anterior Fibers: flex and medially rotate GH joint
Middle Fibers: GH abduction
Posterior Fibers: Extend and laterally rotate GH joint
Innervation: Axillary Nerve
Blood Supply: Posterior Circumflex Humeral Artery
- Teres Major - -"handcuff muscle"
Origin: Inferior lateral border and inferior angle of scapula
Insertion: Lesser tubercle and intertubercular groove of humerus
Action: Extend, adduct, medially rotate GH joint
Innervation: Lower subscapular Nerve
Blood Supply: Circumflex Scapular Artery
- Latissimus Dorsi - -"handcuff muscle"
Origin: Lower thoracic spinous processes, lower ribs, iliac crest
Insertion: Intertubercular groove of humerus
, Action: Extend, adduct, medially rotate GH joint
Innervation: Thoracodorsal Nerve
Blood Supply: Thoracodorsal Artery
- Rotator Cuff Muscles of the Pectoral Girdle - -1. Supraspinatous
2. Teres Minor
3. Subscapularis
4. Infraspinatous
- Supraspinatous Muscle - -Origin: Supraspinous fossa
Insertion: Greater tubercle of humerus
Action: Abducts GH joint, stabilize GH joint
Innervation: Suprascapular Nerve
Blood Supply: Suprascapular Artery
- Teres Minor - -Origin: Superior lateral border of scapula
Insertion: Greater tubercle of humerus
Action: Adducts, laterally rotates GH joint, stabilizes GH joint
Innervation: Axillary Nerve
Blood Supply: Circumflex scapular artery
- Subscapularis - -Origin: Subscapular fossa
Insertion: Lesser tubercle of humerus
Action: Medially rotate GH joint, stabilize GH joint
Innervation: Upper and lower subscapular nerves
Blood Supply: Subscapular artery
- Infraspinatous - -Origin: Infraspinous fossa
Insertion: Greater tubercle of humerus
Action: Adducts, laterally rotates GH joint, stabilize GH joint
Innervation: Suprascapular nerve
Blood Supply: Suprascapular artery
- Anterior Muscles of the Pectoral Girdle - -1. Serratus Anterior
2. Pectoralis Major
3. Subclavius
4. Pectoralis Minor
- Serratus Anterior - -Origin: Ribs 1-8
Insertion: Anterior medial border of scapula
Action: Protracts and superiorly rotates scapula, stabilizes scapula
Innervation: Long thoracic Nerve
Blood Supply: Lateral thoracic artery, superior thoracic artery, thoracodorsal
artery
- Pectoralis Major - -"hug muscle"
Upper Extremity Exam |60 Complete Q’s
and A’s
Origin of Muscle - -The fixed attachment of one end of the muscle to a bone
- Insertion of Muscle - -muscle end attached to the bone that moves when
the muscle contracts
- Posterior Muscles of the Pectoral Girdle - -1. Trapezius
2. Deltoid
3. Teres Major
4. Latissimus Dorsi
- Trapezius Muscle - -- Origin: Occipital Bone, cervical and thoracic spinous
processes
- Insertion: Clavicle, acromion process, spine of scapula
- Action:
Superior fibers: Elevate, superiorly rotate
Middle Fibers: Retract scapula (shoulder blades together)
Inferior Fibers: depress scapula
- Innervation: Accessory Nerve (XII)
- Blood Supply: Dorsal Scapular Artery
- Deltoid Muscle - -Origin: Acromial end of clavicle, acromion and spine of
scapula
Insertion: Deltoid tuberosity of humerous
Action:
Anterior Fibers: flex and medially rotate GH joint
Middle Fibers: GH abduction
Posterior Fibers: Extend and laterally rotate GH joint
Innervation: Axillary Nerve
Blood Supply: Posterior Circumflex Humeral Artery
- Teres Major - -"handcuff muscle"
Origin: Inferior lateral border and inferior angle of scapula
Insertion: Lesser tubercle and intertubercular groove of humerus
Action: Extend, adduct, medially rotate GH joint
Innervation: Lower subscapular Nerve
Blood Supply: Circumflex Scapular Artery
- Latissimus Dorsi - -"handcuff muscle"
Origin: Lower thoracic spinous processes, lower ribs, iliac crest
Insertion: Intertubercular groove of humerus
, Action: Extend, adduct, medially rotate GH joint
Innervation: Thoracodorsal Nerve
Blood Supply: Thoracodorsal Artery
- Rotator Cuff Muscles of the Pectoral Girdle - -1. Supraspinatous
2. Teres Minor
3. Subscapularis
4. Infraspinatous
- Supraspinatous Muscle - -Origin: Supraspinous fossa
Insertion: Greater tubercle of humerus
Action: Abducts GH joint, stabilize GH joint
Innervation: Suprascapular Nerve
Blood Supply: Suprascapular Artery
- Teres Minor - -Origin: Superior lateral border of scapula
Insertion: Greater tubercle of humerus
Action: Adducts, laterally rotates GH joint, stabilizes GH joint
Innervation: Axillary Nerve
Blood Supply: Circumflex scapular artery
- Subscapularis - -Origin: Subscapular fossa
Insertion: Lesser tubercle of humerus
Action: Medially rotate GH joint, stabilize GH joint
Innervation: Upper and lower subscapular nerves
Blood Supply: Subscapular artery
- Infraspinatous - -Origin: Infraspinous fossa
Insertion: Greater tubercle of humerus
Action: Adducts, laterally rotates GH joint, stabilize GH joint
Innervation: Suprascapular nerve
Blood Supply: Suprascapular artery
- Anterior Muscles of the Pectoral Girdle - -1. Serratus Anterior
2. Pectoralis Major
3. Subclavius
4. Pectoralis Minor
- Serratus Anterior - -Origin: Ribs 1-8
Insertion: Anterior medial border of scapula
Action: Protracts and superiorly rotates scapula, stabilizes scapula
Innervation: Long thoracic Nerve
Blood Supply: Lateral thoracic artery, superior thoracic artery, thoracodorsal
artery
- Pectoralis Major - -"hug muscle"
