Shoulder complex muscles Flashcards
Muscles are stimulated to contract by somatic ______ nerves that carry _____ in form of nerve _____ from the brain or _____ cord to the skeletal muscles
somatic motor nerves that carry signals in form of nerve impulses from the brain or spinal cord to the skeletal muscles.
Which are the scapulothoracic joint movements?
Retraction (adduction) Protraction (abduction) Elevation Depression Upward rotation Downward rotation
Origin, insertion, innervation and movement of the TRAPEZIUS muscle
-Origin: >superior nuchal line >external occipital protuberance >ligamentum nuchae >spinous process of vertebrae C7-T12
-Insertion:
>lateral third of the clavicle
>medial aspect of the acromion
>spine of the scapula
-Nerve:
>accessory nerve (CN11)
>anterior rami C3-4
-Mov:
>upper: elevation and upward rotation
>middle: retraction
>lower: depression and upward rotation
Origin, insertion, innervation and movement of the RHOMBOID MAJOR muscle
-Origin:
>spinous process of T2-T5
-Insertion:
>medial border of scapula from inferior angle to the spine)
-Nerve:
>dorsal scapular nerve
-Mov:
>elevation of scapula
>retraction of scapula
>downward rotation of sc
Origin, insertion, innervation and movement of the RHOMBOID MINOR muscle
-Origin:
>spinous processes of C7-T1
>inferior ligamentum nuchae
-Insertion:
>medial border of scapula at the spine
-Nerve:
>dorsal scapular nerve
-Mov:
>retraction
>elevation
>downward rotation
Origin, insertion, innervation and movement of the LEVATOR SCAPULAE muscle
-Origin:
>transverse processes of C1-C4
-Insertion:
>medial border of scapula from superior angle to spine of scapula
-Nerve:
>dorsal scapular nerve
-Mov:
>elevation of the scapula
>downward rotation of scapula
Origin, insertion, innervation and movement of the PECTORALIS MINOR muscle
-Origin:
>anterior surface of ribs 2-5
-Insertion:
>coracoid process of scapula
-Nerve:
>medial pectoral nerve
-Mov:
>protraction of scapula
Origin, insertion, innervation and movement of the SERRATUS ANTERIOR muscle
-Origin:
>laterally on the upper 9 ribs
-Insertion:
>anterior surface of medial border of scapula
-Nerve:
>long thoracic nerve
-Mov:
>protraction
>assists upward rotation
Which are the glenohumeral joint movements
- flexion
- extension
- adduction
- abduction
- circumduction
- internal rotation
- external rotation
Origin, insertion, innervation and movement of the DELTOID muscle
-Origin:
>lateral third of the clabicel
>acromion process
>spine of the scapula
-Insertion:
>deltoid process of the humerus
-Nerve:
>axillary nerve
-Mov:
>abduction
>anterior fibres: flexion, some internal rotation
>posterior fibres: extension, some external rotation
Origin, insertion, innervation and movement of the SUPRASPINATUS muscle
-Origin:
>medial 2/3 of the supra-spinous fossa
-Insertion:
>greater tuberosity of the humerus (superior aspect)
-Nerve:
>supra-scapular nerve
-Mov:
>abduction
>rotator cuff stability
Origin, insertion, innervation and movement of the PECTORALIS MAJOR muscle
-Origin:
>clavicular head: anterior surface of medial clavicle
>sternocostal head: anterior surface of sternum, costal cartilages ribs 1-6, aponeurosis of external oblique muscle
-Insertion:
>lateral lip of the inter tubercular groove
-Nerve:
>medial and lateral pectoral nerve
-Mov: >adduction >internal rotation >flexion(clavicular fibres) >extension (sternocostal fibres) >assists protraction (scapular movement)
Origin, insertion, innervation and movement of the BICEPS BRACHII muscle
-Origin:
>long head- supraglenoid tubercle of scapula
>short head-coracoid process of scapula
-Insertion:
>radial tuberosity of the radius
-Nerve:
>muscolocutaneus nerve
-Mov:
>shoulder flexion
>elbow flexion
>forearm supination
Origin, insertion, innervation and movement of the CORACOBRACHIALIS muscle
-Origin:
>coracoid process of the scapula
-Insertion:
>anteromedial shaft on the humerus
-Nerve:
>muscolocutaneus nerve
-Mov:
>shoulder flexion
>shoulder adduction
Origin, insertion, innervation and movement of the LATISSIMUS DORSI muscle
-Origin: >posterior iliac crests >spinous processes of T7-T12 >thoracolumbar fascia >9-12 rib
-Insertion:
>floor of the intertubercular groove of humerus
-Nerve:
>thoracodorsal nerve
-Mov:
>shoulder extension
>shoulder internal rotation
>shoulder adduction
Origin, insertion, innervation and movement of the TERES MAJOR muscle
-Origin:
>lateral border and inferior angle of scapula
-Insertion:
> medial lip of intertubercular groove of humerus
-Nerve:
>lower subscapular nerve
-Mov:
>shoulder internal rotation
>shoulder extension
>shoulder adduction
Origin, insertion, innervation and movement of the TRICEPS BRACHII muscle
-Origin:
>long head: infraglenoid tubercle of scapula
>lateral head: posterior humerus superior to radial groove
>medial head: posterior humerus inferiorto radial groove
-Insertion:
>olecranon process of the ulna
-Nerve:
>radial nerve
-Mov:
>elbow extension
>shoulder extension (long head)
>shoulder adduction (long head)
Origin, insertion, innervation and movement of the SUBSCAPULARIS muscle
-Origin:
>subscapular fossa of scapula
-Insertion:
>lesser tuberosity of humerus
-Nerve:
>upper and lower subscapular nerve
-Mov:
>shoulder internal rotation
Origin, insertion, innervation and movement of the INFRASPINATUS muscle
-Origin:
>medial 2/3 of the infraspinous fossa
-Insertion:
>posteriorly on the greater tuberosity of humerus
-Nerve:
>subscapularis nerve
-Mov:
>shoulder external rotation
Origin, insertion, innervation and movement of the TERES MINOR muscle
-Origin:
>lateral border of the scapula
-Insertion:
>posteriorly on the greater tuberosity of humerus
-Nerve:
>axillary nerve
-Mov:
>shoulder external rotation
