Anatomy Lab - Unit 2

Shoulder/Arm Muscles

Trapezius

Origin: Occipital protuberance
Insertion: Spine of scapula, Acromion, Clavicle

Blood supply: Transverse Cervical

Innervation (nerve): Spinal Accessory (CN XI) and C1-C5

Latissimus Dorsi

Origin: T7-L5
Insertion: Bicipetal groove

Blood supply: Thoracodorsal

Innervation (nerve): Thoracodorsal

Rhomboideus Major/Minor

Major origin: T2-T5 spinous process
Major insertion: vertebral border

Minor origin: C7-T1 spinous process
Minor insertion: spine of scapula

Blood supply: Dorsal Scapula

Innervation (nerve): Dorsal Scapula

Levator Scapulae

Origin: C1-C4 transverse process
Insertion: superior angle of scapula

Blood supply: Dorsal Scapula and Transverse Cervical

Innervation (nerve): Dorsal Scapula

Supraspinatus

Origin: Supraspinous fossa
Insertion: Head of humerus

Blood supply: Supascapular

Innervation (nerve): Subscapular

Infraspinatus

Origin: Infraspinous fossa
Insertion: Head of humerus

Blood supply: Circumflex Scapular

Innervation (nerve): Suprascapular

Subscapularis

Origin: Subscapular fossa
Insertion: Lesser tuberosity of humerus

Blood supply: Subscapular

Innervation (nerve): Subscapular

Teres Minor

Origin: Lateral edge of scapula
Insertion: Head of humerus

Blood supply: Circumflex Scapular

Innervation (nerve): Axillary

Teres Major

Origin: inferior angle of scapula
Insertion: medial lip of bicipital groove

Blood supply: Circumflex Scapular

Innervation (nerve): Subscapular

Deltoid (posterior, anterior, and middle)

Origin: spine of scapula, lateral clavicle, acromion process
Insertion: deltoid tuberosity

Blood supply: Posterior Humeral Circumflex

Innervation (nerve): Axillary

Pectoralis Minor

Origin: 3rd-5th rib
Insertion: coracoid process

Blood supply: Pectoral Branch of Thoracoacromial

Innervation (nerve): Medial Pectoral

Pectoralis Major

Origin: medial clavicle, sternum, upper 6 ribs
Insertion: bicipital groove

Blood supply: Pectoral Branch of Thoracoacromial

Innervation (nerve): Pectoral

Subclavius

Origin: first rib/coastal cartilage
Insertion: groove on the inferior surface of the middle third of the clavicle

Blood supply: Clavicular Branch of Thoracoacromical

Innervation (nerve): Subclavian

Serratus Anterior

Origin: upper 8-9 ribs
Insertion: medial border of scapula

Blood supply: Later Thoracic

Innervation (nerve): Long Thoracic

Platysma

Origin: Upper thorax and shoulder region
Insertion: Inferior border of mandible

Blood supply: Branch of Suprascapular (of Thyrocervical Trunk)

Innervation (nerve): Facial

Quadrangular Space

“Dot of i”

Blood supply: Posterior humeral circumflex

Innervation (nerve): Axillary

Triangular Interval

“Bottom stem of i”

Blood supply: Profunda Brachii

Innervation (nerve): Radial

Triangular Space

“Sideways stem of i”

Blood supply: Circumflex scapular

Deltopectoral Triangle

Triangular space between deltoid, clavicle, and pectoralis major

Coracobrachialis

Origin: Coracoid process
Insertion: Anterior medial shaft of humerus

Blood supply: Brachial

Innervation (nerve): Musculocutaneous

Biceps Brachii Heads (Long and short)

Origin: Supraglenoid tubercle
Insertion: Radial tuberosity

Blood supply: Brachial

Innervation (nerve): Musculocutaneous

Brachialis

Origin: Anterior surface of distal humerus
Insertion: Coranoid process of ulna / ulnar tuberosity

Blood supply: Brachial

Innervation (nerve): Musculocutaneous (motor) and Radial (sensory)

Triceps Brachii Heads (Long, lateral and medial)

Medial = underneath both, lateral = lateral, long = medial

Origin: Infraglenoid tubercle (long), posterior humerus (lateral)
Insertion: Olecranon process

Blood supply: Profunda Brachii

Innervation (nerve): Radial

Brachioradialis

Origin: upper lateral supracondylar ridge of humerus and lateral intermuscular septum
Insertion: distal radius just proximal to the styloid process

Blood supply: Radial recurrent

Innervation (nerve): Radial

Scapula (borders and angles)

Glenoid Cavity (Scapula)

Flat cavity where head of humerus articulates to form shoulder joint

Labrum (Scapula)

Cartilage of glenoid cavity

Coracoid Process (Scapula)

hook-shaped bony structure coming outward from anterior Scapula

Acromion Process (Scapula)

posterior peak of Scapula, extends over shoulder joint to connect with clavicle

Suprascapular notch (Scapula)

small divot next to base of coracoid process, anterior

Infraspinous Fossa (Scapula)

posterior

Supraspinous Fossa (Scapula)

posterior

Subscapular Fossa (Scapula)

anterior

Sternal end (Clavicle)

Flat, connects to sternum

Acromial end (Clavicle)

Curvy end, connects to acromion process

Acromioclavicular ligament

Between acromion and clavicle

Coracoacromial ligament

Between acromion and coracoid

Coracoaclavicular ligament

Between coracoid and clavicle

Sternoclavicular ligament

Between sternum and clavicle

Transverse Scapular ligament

Covers suprascapular notch

Head (Humerus)

Medial/inside

Anatomical Neck (Humerus)

“Invisible” structure, around head

Surgical Neck (Humerus)

“Invisible” structure, under head

Greater Tubercle (Humerus)

More lateral, bigger bump near head

Lesser Tubercle (Humerus)

Smaller bump, more interior near head

Intertubercular Groove (Humerus)

Divot between tubercles

Deltoid Tuberosity (Humerus)

Rough surface below tubercles, lateral side of humerus, where deltoids insert

Radial Groove (Humerus)

Runs down anterior surface, to left of deltoid tuberosity

Medial Epicondyle (Humerus)

“My” - Most medial protuberence at bottom of humerus

Trochlea (Humerus)

“Team” - Second most medial proptuberence, right of epicondyle

Capitulum (Humerus)

“Can’t” - Middle of bowtie, to right of trochlea

Lateral Epicondyle (Humerus)

“Lose” - Lateral most protuberence

Coronoid Fossa (Humerus)

Big divot above lower humerus, anterior

Olecranon Fossa (Humerus)

Big divot on other side, posterior

Radial Fossa (Humerus)

To right of coronoid fossa, above capitulum

Brachial Plexus

Real
Teataps
Drink
Cold
Beer