Unit 2 OAIN for Anatomy

Obliques capitis superior m. Origin

Transverse process of vertebrae C1

Obliquus capitis superior m. Insertion

Occipital bone between superior and inferior nuchal lines

Obliquus capitis superior m. Action

Bilateral head extension and unilateral lateral flexion

Obliquus capitis superior m. Innervation

Suboccipital protuberance (posterior rami of C1)

Obliquus capitis inferior m. Origin

Posterior tubercle of posterior arch of vertebra C2 (axis)

Obliquus capitis inferior m. Insertion

Transverse process of vertebra C1 (atlas)

Obliquus capitis inferior m. Action

Rotation of C1 and C2)

Obliquus capitis inferior m. Innervation

Suboccipital n. (Posterior rami of C1)

Recuts capitis posterior major m. Origin

Spinous process of C2

Recuts capitis posterior major m. Insertion

LAteral part of inferior nuchal line of occipital bone

Recuts capitis posterior major m. Action

Head extension and rotation of c1 and C2

Recuts capitis posterior major m. Innervation

Suboccipital n. (Posterior rami of C1)

Recuts capitis posterior minor m. Origin

Posterior tubercle os posterior arch of vertebra C1 (atlas)

Recuts capitis posterior minor m. Insertion

MEdial part of inferior nuchal line of occipital bone

Recuts capitis posterior minor m. Action

Head extension and rotation of C1 and C2

Recuts capitis posterior minor innervation

Suboccipital n. (Posterior rami of C1)

Muscles in the Suboccipital triangle

Inferior: Obliquus capptitis inferior
Medial: recuts capitis superior major m.
Lateral: Obliquus capitis superior

Structures in Suboccipital triangle

Suboccipital n. (C1) Greater occipital n. (C2) vertebral a.

Supraspinatus origin

Supraspinatus fossa

Supraspinatus insertion

Superior facet of greater tubercle

Supraspinatus action

Initiates shoulder abduction

Supraspinatus innervation

Suprascapular n.

Infraspinatus origin

Infraspiantus fossa

Infraspinatus insertion

Middle facet of greater tubercle

Infraspiantus action

Shoulder external rotation

Infraspiantus innervation

Suprascapular n.

Teres minor origin

Middle part of lateral border of scapula

Teres minor insertion

Inferior facet of greater tubercle

Teres minor action

Shoulder external rotation

Teres minor innervation

Axillary n.

Subscapularis origin

Subscapular fossa

Subscapularis insertion

Lesser tubercle

Subscapularis action

Shoulder internal rotation

Subscapularis innervation

Upper and lower subscapular n.

The 4 rotator cuff muscles

Teres I or, Subscapularis, Infraspinatus, supraspinatus

Teres major origin

Inferior part of lateral border of scapula

Teres major insertion

Medial lip of bicepital groove

Teres major action

Shoulder adduction, internal rotation, weak extension

Teres major innervation

Lower subscapular n.

Serratus anterior origin

External surface of lateral ribs (1-8)

Serratus anterior insertion

Anterior surface of medial border of scapula

Serratus anterior action

Scapula protractions and stabilization

Serratus anterior innervation

Long thoracic n.

Deltoid origin anterior

LAteral 1/3 of clavicle

Deltoid origin middle

Acromion

Deltoid origin posterior

Scapular spine

Deltoid insertion

Deltoid tuberosity

Deltoid action anterior

Shoulder flexion

Deltoid middle action

Abduction

Deltoid posterior action

Extension

Deltoid innervation

Axillaryn. (C5-C6)

Pectoralis major orign

Anterior medial clavicle, sternum, superior 6 costal cartilages

PEctoralis major insertion

Lateral lip of bicepital groove

Pectoralis major action

Shoulder adduction, internal rotation and flexion

Pectoralis major innervation

Medial and lateral pectoral nn.

Pectoralis minor origin

3-5 ribs (near cartilage)

Pectoralis minor insertion

Scapula protraction;stabilizes

Pectoralis minor innervation

Medial pectoral n.

Subclavius origin

1st rib

Subclavius insertion

Inferior urface of clavicle

Subclavius action

Depress and stabilize scapula

Subclavius innercation

N. To Subclavius

Common features for anterior arm

-flexion (shoulder/elbow)
-Musculocutaneous n.

Posterior common features of the arm

-extension (shoulder/elbow)
-Radian n.

Coracobrachialis m. Origin

Coracoid process

Coracobrachialis m. Insertion

Proximal 1/3 medial humeral shaft

Coracobrachialis m. Action

Shoulder flexion

Coracobrachialis m innervation

Musculocutaneous n.

Biceps brachii origin long head

Supraglenoid tubercle

Biceps brachii insertion

Radial tuberosity

Biceps brachii action

Supination, elbow flexion; shoulder flexion

Biceps brachii innervation

Musculocutaneous n.

Brachialis m. Origin

Distal 1/2 of humeral shaft

Brachialis m. Insertion

Coronoid process

Brachialis m. Action

Elbow flexion (pronation)

Brachialis m. Innervation

Musculocutaneous n.

Brachioradialis m. Origin

Lateral supracondylar ridge

Brachioradialis m. Insertion

Radial styloid process

Brachioradialis m. Action

Elbow flexion (neutral)

Brachioradialis m. Innervation

Radial n.

Elbow flexion supination muscle

Biceps brachii

Elbow flexion neutral muscle

Brachioradialis

Elbow flexion pronation

Brachialis

Triceps brachii m. Origin long head

Infraglenoid tubercle

Triceps brachii m origin lateral head

Posterior humerus (middle)

Triceps brachii m. Origin medial head

Posterior humerus (distal)

Triceps brachii m. Insertion

Olecranon process

Triceps brachii action

Extend elbow

Triceps brachii innervation

Radial n.

Borders of the triangular space

Superior: Teres minor
Inferior: teres major
LAteral: Long head of triceps brachii

Borders of triangular interval

Superior: Teres major
Medial: Long head of triceps
Inferior: Humeral shaft

Borders of quadrangular space

LAteral: Humeral shaft
Superior: teres minor
Inferior: Teres major
Medial: Long head of triceps

Contents of triangular space

Circumflex scapular artery

Quadrangular space

Axillary nerve
Posterior circumflex humeral artery

Triangular interval

Profunda brachii artery
Radial n.

What’s the purpose of the Articular disc

Shock absorption

Anterior forearm common features

-flexion (elbow/wrist/fingers)
-median n. OR ulnar n.

Posterior Common Features forearm

-extension (elbow/wrist/fingers)
-Radial n.

Lateral and medial cords on anterior side of forearm

Musculocutaneous n.
Median n.
Anterior interosseous n.

Medial and Posterior cords on posterior side of forearm

Ulnar n.
Axillary n.
Radial n.
Deep radial n.
Posterior interosseous n.