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ANAT1019 Muscles > Shoulder Region > Flashcards

Shoulder Region Flashcards

1
Q

Upper Trapezius

A

Origin: External occipital protuberance, superior nuchal line, ligamentum nuchae

Insertion: Posterior border of lateral 1/3 clavicle

Action: Scapular elevation, retraction, upward rotation

Innervation: Accessory Nerve (CN XI)

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2
Q

Middle Trapezius

A

Origin: Ligamentum nuchae, C7-T3 spinous processes

Insertion: Medial edge of acromion process, superior edge of spine of scapula

Action: Scapular retraction, (upward rotation as a stabiliser)

Innervation: Accessory Nerve (CNXI)

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3
Q

Lower Trapezius

A

Origin: T4-T12 Spinous processes

Insertion: Tubercle of spine of scapula via aponeurosis

Action: Scapular depression, retraction, upward rotation

Innervation: Accessory Nerve (CNXI)

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4
Q

Levator Scapulae

A

Origin: C1-C5 Transverse processes

Insertion: Medial border of scapula above root of spine of scapula

Action: Scapular elevation, retraction (not as much as rhomboids), downward rotation

Innervation: C3,4 Ventral rami & Dorsal Scapular Nerve (C5 ventral rami)

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5
Q

Rhomboid Minor

A

Origin: C7-T1 Spinous processes, ligamentum nuchae

Insertion: Posterior aspect of medial border @ root of spine of scapula

Action: Scapular elevation, retraction, downward rotation

Innervation: Dorsal Scapular Nerve (C5 Ventral Rami)

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6
Q

Rhomboid Major

A

Origin: T2-5 Spinous processes

Insertion: Posterior aspect of medial border of scapula from root of spine of scapula to inferior angle

Action: Scapular elevation, retraction, downward rotation

Innervation: Dorsal Scapular Nerve (C5 Ventral Rami)

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7
Q

Serratus Anterior

A

Origin: Anterolateral ribs 1-9

Insertion: Costal surface, medial border of scapula

Action: Scapular protraction, upward rotation, stabilise medial border of scapula against thoracic wall

Innervation: Long Thoracic Nerve (C5, 6 & 7 Ventral Rami)

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8
Q

Pectoralis Minor

A

Origin: Coracoid process

Insertion: Anterior ribs 3-5

Action: Anterior tilt, scapular protraction (- pulls coracoid process down anteriorly; secures/anchors coracoid process so muscles of the back can downwardly protract scapula)

Innervation: Medial Pectoral Nerve

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9
Q

Subclavius

A

Origin: Medial 1st rib

Insertion: Subclavian groove of clavicle

Action:
Contraction could provide stability of clavicle and SCJ (accessory muscle for stability) & Resist excessive elevation and lateral translation of clavicle (contraction provides an inferomedial pull and compression to the joint)

Innervation: Subclavian Nerve

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10
Q

Anterior Deltoid

A

Origin: Anterior border of lateral 1/3 clavicle

Insertion: Deltoid tuberosity

Action: GHJ flexion, abduction, horizontal flexion, medial rotation

Innervation: Axillary Nerve (C5 & C6)

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11
Q

Middle Deltoid

A

Origin: Lateral edge of acromion process of scapula

Insertion: Deltoid tuberosity

Action: GHJ abduction

Innervation: Axillary Nerve (C5 & C6)

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12
Q

Posterior Deltoid

A

Origin: Inferior edge of spine of scapula

Insertion: Deltoid tuberosity

Action: GHJ extension, adduction, horizontal extension, lateral rotation

Innervation: Axillary Nerve (C5 & C6)

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13
Q

Supraspinatus

A

Origin: Supraspinous Fossa of scapula

Insertion: Greater tubercle of humerus

Action: GHJ abduction, compression

Innervation: Suprascapular nerve (C5, C6)

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14
Q

Infraspinatus

A

Origin: Infraspinous Fossa of scapula

Insertion: Greater tubercle of humerus

Action: GHJ lateral rotation, abduction (superior portion), compression

Innervation: Suprascapular nerve (C5, C6)

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15
Q

Teres Minor

A

Origin: Upper 2/3 of lateral border of scapula

Insertion: Greater tubercle of humerus

Action: Assist GHJ lateral rotation, compression

Innervation: Axillary Nerve (C5, C6)

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16
Q

Subscapularis

A

Origin: Subscapular Fossa of scapula

Insertion: Lesser tubercle of humerus

Action: GHJ medial rotation, adduction (@ higher angles of adduction), compression

Innervation: Upper and lower subscapular nerves (C5-7)

17
Q

Pectoralis Major

A

Origin:
Clavicular head = Anterior aspect of medial 1/2 of clavicle
Sternal head = Manubrium of sternum
Costal head = Superior 6 costal cartilages

Insertion: Lateral lip of intertubercular sulcus of humerus

Action: GHJ adduction, medial rotation, horizontal flexion
Clavicular head = GHJ flexion
Sternocostal head = GHJ extension

Innervation: Medial and Lateral pectoral nerves

18
Q

Latissimus Dorsi

A

Origin: Spinous processes of T7–L5
vertebrae, thoracolumbar fascia, posterior iliac crest, last 3 ribs

Insertion: Floor of intertubercular sulcus of humerus

Action: GHJ extension, adduction, medial rotation

Innervation: Thoracodorsal nerve (C6-8)

19
Q

Teres Major

A

Origin: Posterior surface of inferior angle of scapula

Insertion: Medial lip of intertubercular sulcus of humerus

Action: GHJ extension, adduction, medial rotation

Innervation: Lower subscapular nerve (C5-7)

ANAT1019 Muscles (19 decks)

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