(UPPER ARM) Scapula + Arm Muscles: Attachments, Nerve, Movement Flashcards
Pectoralis Major m.
A: Anterior Sternum, Medial 1/2 Clavicle, Lateral Lip of Intertubercular Sulcus
Mvmnt:Adducts and Medially rotates GH Joint, Horizontal adduction, flexion
Nerve: Lateral and Medial Pectoral Nerve
Pectoralis Minor m.
A: 3-5th Costal Ribs, Medial border of coracoid
Mvmnt: Anteriorly and inferiorly holds scapula to thoracic wall, downward rotation of scapula
Nerve: Medial Pectoral nerve
Subclavius m.
A: 1st rib and subclavian groove of clavicle
Mvmnt: anchors and depress the clavicle
Nerve: nerve of subclavius
Teres Major m.
A: Inferior angle of posterior scapula , medial lip intertubercular sulcus of humerus
Mvmnt: Adducts and medially rotates GH Joint (arm)
Nerve: Lower Scapular nerve
Teres Minor m.
A: Lateral boarder of scapula, middle to inferior facet of greater tubercle
Mvmnt: Laterally rotates and abducts GH joint (Arm)
Nerve: Axillary Nerve
Infraspinatus m.
A: Infraspinous fossa, greater tubercle of humerus
Mvmnt: Laterally rotates GH Joint (arm) acts , abducts with rotator cuff muscles
Nerve: Suprascapular nerve
Supraspinatus m.
A: Supraspinous fossa, greater tubercle
Mvmnt: Abduction of GH Joint helping middle deltoid and rotator cuff muscles
Nerve: Suprascapular Nerve
Subscapularis m.
A: Subscapular fossa, lesser tubercle of humerus
Mvmnt: medially rotates GH Joint (Arm)
Nerve: Upper + Lower Subscapular nerve
Deltoid m.
A: All Deltoid tuberosity
Anterior–>Lateral 3rd Clavicle
Middle–> acromion
Posterior–>Spine of the scapula
Mvmnt:
Anterior–> flex and medially rotates GH Joint (arm)
Middle–> abducts GH Joint (arm)
Posterior–> extends and laterally rotates GH Joint (arm)
Nerve: Axillary Nerve
Biceps Brachii (Long) m.
A: Radial tuberosity, supraglenoid tubercle
Mvmnt: Flex (HU/HR) and supinate forearm (proximal RU) Flexion of GH
Nerve: Musculocutaneous Nerve
Biceps Brachii (Short) m.
A: Radial tuberosity, coracoid process
Mvmnt: Flex forearm (HR/HU) + Supination Proximal Radioulnar
Nerve: Musculocutaneous Nerve
Brachialis m.
A: Ulna tuberosity, coronoid process, distal half of anterior humerus
Mvmnt: Flex forearm (HU/HR)
Nerve: Musculocutaneous Nerve
Coracobrachialis m.
A: Coracoid Process to middle 3rd humerus
Mvmnt: Flex and medially rotates + adducts GH Joint
Nerve: Musculocutaneous Nerve
Posterior Compartment
Triceps Brachii m.
A:
Long Head:Infraglenoid tubercle of scapula , to proximal end of olecranon of ulna and fascia of forearm
Lateral Head: Post. humerus superior to radial groove , to proximal end of olecranon of ulna and fascia of forearm
Medial Head: Post. humerus inferior to radial groove ,to proximal end of olecranon of ulna and fascia of forearm
Mvment: Extension GH Joint + extensor of forearm, long head resists dislocation of humerus (during adduction)
Innervation: Radial Nerve
Posterior Compartment
Anconeus m.
A: Lateral epicondyle of humerus, lateral surface of olecranon and superior part of posterior surface of ulna
Mvmnt: Assists triceps in extending forearm, stabilizes elbow joint
Innervation: Radial Nerve
Arterial Flow Review
Borders
-Lateral Aspect 1st RIb to Superior Pectoralis minor (AXILLARY ARTERY)
Axillary 1st Part
-Supreme Thoracic A.
-Inferior Boarder of Pectoralis Minor
Axillary 2nd Part
-Thoracoacromial A.
-Lateral Thoracic A.
-Inferior Boarder Teres Major
Axillary 3rd Part
-Subscapular A.
-Anterior Humeral Circumflex A.
-Posterior Humeral Circumflex A.
-Teres Major Muscle (BRACHIAL ARTERY)
-Profunda Brachii A. + Radial Collateral A. +Middle Collateral A.
-Superior Ulnar Collateral A.
-Inferior Ulnar Collateral A.
-SPLIT-
-Radial A. (Splits)
-Ulnar A. (Splits)
-Ulnar: Anterior ulnar recurrent
Posterior unlar recurrent
Common Interosseous
Anterior and posterior innterosseous
Radial: Radial recurrent branch
Recurrent interosseous
Quadrangular Space
Boarders:
-Medially: Long Head of the Triceps Brachii
-Laterally: Humerus
-Superiorly: Teres Minor
-Inferiorly: Teres Major
Contents:
-Posterior Humeral Circumflex A.
-Axillary Nerve.
These run together and go posteriorly
Triangular Space
Boarders:
-Laterally: Long head of the Triceps Brachii
-Superiorly: Teres Minor
-Inferiorly: Teres Major
Contents:
-Circumflex Scapular A.
Triangular Interval
Boarders:
-Medially: Long head of Triceps Brachii
-Laterally: Lateral head of Triceps Brachii
-Superiorly: Teres Major
Contents:
-Radial Nerve
Profunda Brachii A.
What are the articulations of the humerus?
1) Glenohumeral (glenoid fossa with humeral head)
2) Humeroradial (Capitulum of humerus with head of radius)
3) Humeroulnar (trochlea of humerus with trochlear notches of ulna)
How would you differentiate 4 rotator cuff muscles? (SSIT)
-Subscapularis= Lesser Tubercle
-Supraspinatus= Greater Tubercle (closest to intertubercular sulcus)
-Infraspinatus= Greater Tubercle (2nd to intertubercular sulcus more lateral)
-Teres Minor Greater Tubercle (most lateral to intertubercular sulcus)
What is the difference between teres major, latissimus dorsi, and pectoralis major on their attachment to humerus?
-Teres Major-Medial Sulcus (lip)
-Latissimus Dorsi- Floor of intertubercular Sulcus
-Pectoralis Major- Lateral Sulcus (lip)
What are the motions at glenohumeral joint? (GH JT)
-Flexion
-Extension
-Horizontal Adduction
-Horizontal Abduction
-Internal Rotation (Medial)
-External Rotation (Lateral)
-Circumduction
-Scaption
Serratus Anterior m.
A: External surfaces of lateral parts 1st-8th ribs to Anterior Surface of medial boarder of the Scapula
Mvmnt: Protracts scapula and holds it against thoracic wall , Upward rotation of scapula, depression of scapula
Bones associated with shoulder scapula
Scapula, Proximal humerus, clavicle
Movement of Scapula:
Elevation
Trapezius , upper
-Spinal Accessory Nerve 11 CN XI)
Levator Scapulae
Rhomboids
-Dorsal Scapular
Movement of Scapula:
Depression
Latissimus Dorsi- Thoracodorsal
Trapezius, lower - (CN XI)
Serratus Anterior- Long Thoracic
Pectoralis Minor- Medial Pectoral
Movement of Scapula:
Protraction
Serratus Anterior- Long Thoracic
“Pecs”-Major and minor
(fiber orientation)
Movement of Scapula:
Retraction
Trapezius, middle- (CN XI)
Rhomboids- Dorsal Scapular
Movement of Scapula:
Upward Rotation
Trapezius- upper+lower- (CN XI)
Serratus Anterior- Long Thoracic
Movement of Scapula:
Downward Rotation
Levator Scapulae- Dorsal Scapular
Rhomboids- Dorsal Scapular
Latissimus Dorsi- Thoracodorsal
Pectoralis Minor- Medial Pectoral
Arterial Blood Flow SUPPLY (Axillary)
Supreme Thoracic
-Serratus Anterior and Intercostals 1+2
Thoracoacromial
-SC,AC, Deltoid, Pec Major
Lateral Thoracic
-Serratus Anterior, Pectoralis Major, Pectoralis Minor
Subscapular
-Latissimus Dorsi, Infraspinatus,Supraspinatus
Anterior Humeral Circumflex
-GH JT, Deltoid
Posterior Humeral Circumflex
-GH JT, Deltoid, Triceps
