Functional Anatomy - Shoulder (Detailed) Flashcards
State the origin, insertion, isometric, concentric and eccentric functions for the muscle in yellow:
SERRATUS ANTERIOR
ORIGIN
Ribs 4–12
INSERTION
Medial border of the scapula
Concentric Action
Scapular protraction
Eccentric Action
Scapular retraction
Isometric Action
Stabilizes the scapula
INNERVATION
Long thoracic nerve (C5–C7)
State the origin, insertion, isometric, concentric and eccentric functions for the muscle in yellow:
RHOMBOIDS
ORIGIN
Spinous processes of C7–T5
INSERTION
Medial border of the scapula
Concentric Action
Produces scapular retraction and downward rotation
Eccentric Action
Scapular protraction and upward rotation
Isometric Action
Stabilizes the scapula
INNERVATION
Dorsal scapular nerve (C4–C5)
State the origin, insertion, isometric, concentric and eccentric functions for the muscle in yellow:
LOWER TRAPEZIUS
ORIGIN
Spinous processes of T6–T12
INSERTION
Spine of the scapula
Concentric Action
Scapular depression
Eccentric Action
Scapular elevation
Isometric Action
Stabilizes the scapula
INNERVATION
Cranial nerve XI, ventral rami C2–C4
State the origin, insertion, isometric, concentric and eccentric functions for the muscle in yellow:
MIDDLE TRAPEZIUS
ORIGIN
Spinous processes of T1–T5
INSERTION
Acromion process of the scapula; Superior aspect of the spine of the scapula
Concentric Action
Scapular retraction
Eccentric Action
Scapular protraction and elevation
Isometric Action
Stabilizes scapula
INNERVATION
Cranial nerve XI, ventral rami C2–C4
State the origin, insertion, isometric, concentric and eccentric functions for the muscle in yellow:
UPPER TRAPEZIUS
ORIGIN
External occipital protuberance of the skull; Spinous process of C7
INSERTION
Lateral third of the clavicle; Acromion process of the scapula
Concentric Action
Cervical extension, lateral flexion, rotation, scapular elevation
Eccentric Action
Cervical flexion, lateral flexion, rotation, scapular depression
Isometric Action
Stabilizes the cervical spine and scapula, stabilizes the medial border of the scapula creating a stable base for the prime movers during scapular abduction and upward rotation
INNERVATION
Cranial nerve XI, ventral rami C2–C4
State the origin, insertion, isometric, concentric and eccentric functions for the muscle in yellow:
LEVATOR SCAPULAE
ORIGIN
Transverse processes of C1–C4
INSERTION
Superior vertebral border of the scapulae
Concentric Action
Cervical extension, lateral flexion, and ipsilateral rotation when the scapulae is anchored; Assists in elevation and downward rotation of the scapulae
Eccentric Action
Cervical flexion, contralateral cervical rotation, lateral flexion, scapular depression, and upward rotation when the neck is stabilized
Isometric Action
Stabilizes the cervical spine and scapulae
INNERVATION
Ventral rami C3–C4, dorsal of scapular nerve
State the origin, insertion, isometric, concentric and eccentric functions for the muscle in yellow:
PECTORALIS MAJOR
ORIGIN
Anterior surface of the clavicle; Anterior surface of the sternum, cartilage of ribs 1–7
INSERTION
Greater tubercle of the humerus
ISOLATED FUNCTION
Concentric Action
Shoulder flexion (clavicular fibers), horizontal adduction, and internal rotation
Eccentric Action
Shoulder extension, horizontal abduction, and external rotation
Isometric Action
Stabilizes the shoulder girdle
INNERVATION
Medial and lateral pectoral nerve (C5–C7)
State the origin, insertion, isometric, concentric and eccentric functions for the muscle in yellow:
PECTORALIS MINOR
ORIGIN
Ribs 3–5
INSERTION
Coracoid process of the scapula
Concentric Action
Protracts the scapula
Eccentric Action
Scapular retraction
Isometric Action
Stabilizes the shoulder girdle
INNERVATION
Medial pectoral nerve (C6–T1)
State the origin, insertion, isometric, concentric and eccentric functions for the muscle in yellow:
ANTERIOR DELTOID
ORIGIN
Lateral third of the clavicle
INSERTION
Deltoid tuberosity of the humerus
ISOLATED FUNCTION
Concentric Action
Shoulder flexion and internal rotation
INTEGRATED FUNCTION
Eccentric Action
Shoulder extension and external rotation
Isometric Action
Stabilizes the shoulder girdle
INNERVATION
Axillary nerve (C5–C6)
State the origin, insertion, isometric, concentric and eccentric functions for the muscle in yellow:
MEDIAL DELTOID
ORIGIN
Acromion process of the scapula
INSERTION
Deltoid tuberosity of the humerus
Concentric Action
Shoulder abduction
Eccentric Action
Shoulder adduction
Isometric Action
Stabilizes the shoulder girdle
INNERVATION
Axillary nerve (C5–C6)
State the origin, insertion, isometric, concentric and eccentric functions for the muscle in yellow:
POSTERIOR DELTOID
ORIGIN
Spine of the scapula
INSERTION
Deltoid tuberosity of the humerus
Concentric Action
Shoulder extension and external rotation
Eccentric Action
Shoulder flexion and internal rotation
Isometric Action
Stabilizes the shoulder girdle
INNERVATION
Axillary nerve (C5–C6)
State the origin, insertion, isometric, concentric and eccentric functions for the muscle in yellow:
TERES MINOR
ORIGIN
Lateral border of the scapula
INSERTION
Greater tubercle of the humerus
Concentric Action
Shoulder external rotation
Eccentric Action
Shoulder internal rotation
Isometric Action
Stabilizes the shoulder girdle
INNERVATION
Axillary nerve (C5–C6)
State the origin, insertion, isometric, concentric and eccentric functions for the muscle in yellow:
INFRASPINATUS
ORIGIN
Infraspinous fossa of the scapula
INSERTION
Middle facet of the greater tubercle of the humerus
Concentric Action
Shoulder external rotation
INTEGRATED FUNCTION
Eccentric Action
Shoulder internal rotation
Isometric Action
Stabilizes the shoulder girdle
INNERVATION
Suprascapular nerve (C5–C6)
State the origin, insertion, isometric, concentric and eccentric functions for the muscle in yellow:
SUBSCAPULARIS
ORIGIN
Subscapular fossa of the scapula
INSERTION
Lesser tubercle of the humerus
Concentric Action
Shoulder internal rotation
Eccentric Action
Shoulder external rotation
Isometric Action
Stabilizes the shoulder girdle
INNERVATION
Upper and lower subscapular nerve (C5–C6
State the origin, insertion, isometric, concentric and eccentric functions for the muscle in yellow:
SUPRASPINATUS
ORIGIN
Supraspinous fossa of the scapula
INSERTION
Superior facet of the greater tubercle of the humerus
Concentric Action
Abduction of the arm
Eccentric Action
Adduction of the arm
Isometric Action
Stabilizes the shoulder girdle
INNERVATION
Suprascapular nerve (C5–C6)
State the origin, insertion, isometric, concentric and eccentric functions for the muscle in yellow:
TERES MAJOR
ORIGIN
Inferior angle of the scapula
INSERTION
Lesser tubercle of the humerus
Concentric Action
Shoulder internal rotation, adduction, and extension
Eccentric Action
Shoulder external rotation, abduction, and flexion
Isometric Action
Stabilizes the shoulder girdle
INNERVATION
Lower subscapular nerve
