Flashcards

Muscles and Actions

dndk Body Anatomy Anatomy English 16 cards

Cards in this deck (16)

1Muscles of the Shoulder GirdleMUSCLES OF THE SHOULDER GIRDLE
TRAPEZIUS (Upper Division)
TRAPEZIUS (Middle Division)
TRAPEZIUS (Lower Division)
LEVATOR SCAPULAE
RHOMBOID MAJOR
RHOMBOID MINOR
SERRATUS ANTERIOR
PECTORALIS MINOR
SUBCALVIUS
2Posterior View TRAPEZIUS (Upper Division)Posterior View TRAPEZIUS (Upper Division)
ORIGIN: External occipital protuberance, medial 1/3 of superior nuchal line, ligamentum nuchae and spinous process of the 7th cervical vertebrae.
INSERTION: Lateral 1/3 of clavicle and acromion p
3Posterior View TRAP EZIUS (Middle Division)Posterior View TRAP EZIUS (Middle Division)
ORIGIN: Spinous processes of 1st - 5th thoracic vertebrae. INSERTION: Superior border of spine of scapula. ACTION: Retracts and aids in elevation of scapula. NERVE SUPPLY: Spinal accessory and ve
4Posterior View TRAPEZIUS (Lower Division)Posterior View TRAPEZIUS (Lower Division) ORIGIN: Spinous processes of 6th - 12th thoracic vertebrae.
INSERTION: Medial 1/3 of spine of the scapula.
ACTION: Depresses the scapula. Retracts the scapula. Rotates the scapula upwards so the g
5Posterior View LEVATOR SCAPULAEPosterior View LEVATOR SCAPULAE
ORIGIN: Transverse processes of first four cervical vertebrae. INSERTION: Vertebral border of scapula between superior angle and scapular spine.
ACTION: Elevates the scapula and rotates the scapula downwards so the glenoid cavity faces inferiorly. Working with the upper trapezius, elevates and retracts the scapula.
REVERSED ORIGIN-INSERTION ACTION: When scapula is fixed, laterally flexes and slightly rotate_s cervical spine to the same side.
NERVE SUPPLY: Dorsal scapular C5, and ventral rami of C3, 4.
SYNERGISTS: Rhomboids and trapezius.
6Posterior View RHOMBOID MAJORPosterior View RHOMBOID MAJOR
ORIGIN: Spinous processes of 2nd - 5th thoracic vertebrae. INSERTION: Medial border of scapula from spine to inferior angle. ACTION: Retracts and elevates the scapula. The inferior fibers aid in rotating the glenoid cavity inferiorly. NERVE SUPPLY: Dorsal scapular, C4, 5.
SYNERGISTS: Upper, middle and lower trapezius, levator scapulae, latissimus dorsi, rhomboid minor.
7Posterior View RHOMBOID MINORPosterior View RHOMBOID MINOR
ORIGIN: Lower part of ligamentum nuchae, spinous processes of C7 and Ti. INSERTION: Medial border of scapula at the root of the spine of the scapula. ACTION: Retracts and elevates the scapula. Assists in rotating the scapula downwards. NERVE SUPLY: Dorsal scapular, C4, 5.
SYNERGISTS: Upper, middle and lower trapezius, levator scapulae, latissimus dorsi and rhomboid major.
8Lateral View SERRATUS ANTERIOR ORIGIN:Lateral View SERRATUS ANTERIOR ORIGIN: Superior lateral surfaces of upper 8 or 9 ribs at the side of the chest.
INSERTION: Costal surface of the vertebral border along the inferior angle of scapula.
ACTION: Protracts scapula and rotates it upwards to point the glenoid cavity superiorly. Stabilizes vertebral border of scapula to thoracic cage, along with rhomboids and middle trapezius.
NERVE SUPPLY: Long thoracic, C5, 6, 7. SYNERGIST: Pectoralis minor. (The scapula is pulled back off the rib cage to view the anterior surface of the scapula.)
9MUSCLES OF THE SHOULDERMUSCLES OF THE SHOULDER
DELTOID (Anterior Division)
DELTOID (Middle Division)
DELTOID (Posterior Division)
PECTORALIS MAJOR (Sternal Division)
PECTORALIS MAJOR (Clavicular Division)
CORACOBRACHIALIS
LATISSIMUS DORSI
TERES MAJOR
SUPRASPINATUS
INFRASPINATUS
TERES MINOR
SUBSCAPULARIS
10Anterior View PECTORAL'S MINORAnterior View PECTORAL'S MINOR
ORIGIN: Anterior surfaces of 3rd, 4th and 5th ribs near the costal cartilages.
INSERTION: Coracoid process of the scapula.
ACTION: Depresses scapula and rotates scapula downward. Im-portant anterior shoulder stabilizer.
REVERSED ORIGIN-INSERTION ACTION: When the scapula is fixed, it aids in rib elevation in forced inspiration.
NERVE SUPPLY: Medial pectoral nerve from brachial plexus, C6, 7, 8.
SYNERGISTS: Pectoralis major, serratus anterior.
11Anterior View SUBCLAVIUSAnterior View SUBCLAVIUS
ORIGIN: 1st rib at the junction of the costal cartilage.
INSERTION: Groove on the inferior surface of the clavicle, between the costoclavicular and conoid ligaments.
ACTION: Depresses clavicle, pulls it inferiorly and anteriorly.
NERVE SUPPLY: Subclavian branch of the brachial plexus, C5, 6.
12Superior View DELTOID (Middle Division)Superior View DELTOID (Middle Division)
ORIGIN: Superior surface of the acromion process.
INSERTION: Deltoid tuberosity of humerus. ACTION: Abduction of the humerus at the shoulder. NERVE SUPPLY: Axillary, C5, 6.
SYNERGISTS: Anterior and posterior deltoid divisions, supraspinatus.
13Superior View DELTOID (Posterior Division)Superior View
DELTOID
(Posterior Division)
ORIGIN: Inferior margin of spine of scapula.
INSERTION: Deltoid tuberosity of humerus.
ACTION: Abduction, horizontal extension and lateral rotation of the
humerus at the shoulder.
NERVE SUPPLY: Axillary, C5, 6.
SYNERGISTS: Anterior and middle divisions of deltoid,
supraspinatus.
14Anterior View PECTORALIS MAJOR (Clavicular Division)Anterior View
PECTORALIS MAJOR
(Clavicular Division)
ORIGIN: Anterior surface of the medial 1/2 of the clavicle.
INSERTION: Lateral lip of the intertubercular sulcus of the
humerus. Crest of greater tubercle.
ACTION: Flexion, adduction, horizontal flexion and medial rotation
of the humerus at the shoulder.
NERVE SUPPLY: Lateral pectoral, C5, 6.
SYNERGISTS: Biceps brachi, pectoralis major (sternal division),
latissimus dorsi, deltoid (anterior division).
15Anterior View PECTORALIS MAJOR (Sternal Division)Anterior View
PECTORALIS MAJOR
(Sternal Division)
ORIGIN: Sternum to 7th rib, cartilages of true ribs and aponeurosis
of external abdominal oblique muscle.
INSERTION: Lateral lip of the intertubercular sulcus of the
humerus. Crest of greater tubercle.
ACTION: Flexion, adduction ,medial rotation and horizontal flexion
of the humerus at the shoulder. Also extends flexed humerus.
Through its action on the humerus it depresses, protracts and
rotates scapula downwards.
NERVE SUPPLY: Lateral and medial pectoral, C7, 8, Ti.
SYNERGISTS: Latissimus dorsi, subscapularis, teres major.
16Quadriceps Actions