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ANAT 314 > Lecture 17: pectoral girdle > Flashcards

Lecture 17: pectoral girdle Flashcards

(58 cards)

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1
Q

Name bones of pectoral girdle

A

Scapula
Clavicle
= 2 halves with a lot more mobility

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2
Q

Describe sternal end clavicle

A

Articulates with sternum

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3
Q

Describe Conoid tubercle clavicle

A

Points posteriorly

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4
Q

Describe shaft clavicle

A

Middle part, curved

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5
Q

Describe acromial end clavicle

A

Articulate with acromion

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6
Q

What is present on inferior surface clavicle

A

Groove for Subclavius muscle = defining feature of inferior surface

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7
Q

Which side of clavicle longer

A

Medially much longer
Laterally shorter

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8
Q

What does scapula articulate with

A

Clavicle and humerus

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9
Q

Describe scapula bone shape

A

Irregularly shaped flat bone ~triangular ish

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10
Q

What does scapula have

A

Fossae and borders = provides surfaces for muscle attachments

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11
Q

Name parts of scapula that serve as muscle attachment sites for shoulder muscles

A

Thick bony projections =
Spine, coracoid process, acromion, supra an infra glenoid tubercles

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12
Q

Describe borders of scapula

A

Superior border (top, next to coracoid process)
Lateral border = more straight, linear
Medial border = curved Ish, inside

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13
Q

Describe processes/projections of scapula

A

Coracoid process = like hook
Acromion (extension of spine)
Spine of scapula - med to lat

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14
Q

Describe fossae of scapula

A

Subscapular fossa = ant
Supraspinous fossa= post, above spine
Infraspinous fossa = post, below spine

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15
Q

Describe angles of scapula

A

Superior angle
Lateral angle - under acromion, articulates with head of humerus
Inferior angle - bottom of triangle

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16
Q

Describe important parts of lateral view scapula - tubercles/fossa

A

Supra glenoid tubercle
Glenoid fossa = shoulder joint facet
Infra genloid tubercle

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17
Q

Name the 4 joints of pectoral girdle

A

Acromioclavicular = post to ant, forms pectoral girdle
Sternoclavicular joint
Scapulothoracic joint - scapula + rib cage
Glenohumeral joint and subacromial space =genloid facet and numeral head

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18
Q

Joint type acromioclavicular joint

A

Synovial joint
Planar/gliding
But limited movement

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19
Q

Movements acromioclavicular joint

A

Almost no mobility
Due to presence of strong ligaments that link movement of scapula and clavicle on same side - so cannot move on own

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20
Q

Name the 3 ligaments of acromioclavicular joint

A

Acromioclavicular ligament
Coracoclavicular ligament
Coracoacromial ligament

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21
Q

Describe acromioclavicular ligament

A

Reinforces fibrous capsule - thickening of it

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22
Q

Describe coracoacromial ligament

A

Links 2 parts of same bone
Stars and ends on same bone =
Provides stability to roof of glenohumeral joint

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23
Q

Describe coracoclavicular ligament

A

Strongest!!!!
Made up of trapezoid ligament and conoid ligament (attaches to conoid tubercle)

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24
Q

What does acromioclavicular joint Do

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A

Synchronizes scapula and clavicle

25
Describe joint type sternoclavicular joint
Synovial joint - complex Between clavicle (sternal end), manubrium and first costal cartilage Saddle - biaxial geometry = articular surfaces are concave along one axis and convex along other = baxial
26
Movements sternoclavicular joint
Protraction/retraction Elevation/depression
27
What is scapulothoracic joint
Not an anatomical joint = no synovial capsule, cartilage or ligaments But it is a physiological joint = permits motion of bones without features of synovial joints
28
Describe joint region scapulothoracic joint
Anterior surface of scapula (subscapular surface) against posterior surface ribs 2-7
29
Descrive muscles scapulothoracic joint
Subscapualris and serrratus anterior With lose ct between to facilitate gliding (Lay against each other - muscle to muscle)
30
Describe function scapulothoracic joint
Enables scapular motion Integrates pectoral girdle with shoulder joint (scapula + humerus) = increase rom of shoulder complex (Scapulothoracic with glenohumeral, = so can reach higher)
31
Describe movements of pectoral girdle at scapulothoracic joint
Elevation/depression Protraction (abduction)/retraction (addiction) Upwards/downwards rotation (adds extra rom to shoulder)
32
Where does most movement at scapulothoracic joint occur - explains
Most of movement actually happens at sternoclavicular joint bc of strong ligaments that link scapula and clavicle and the relatively immobile acromioclavicular joint * motion needs to happen at actual synovial joint = sternoclavicular joint
33
Name anterior muscles of scapulothoracic joint
Subclavius Pectoralis minor
34
Pectoralis minor attachments
Anterior ribs 3-5 to coracoid process of scapula
35
Pectoralis minor functions
Depresses, protracts and rotates scapula inferiorly (downwards rotation)
36
Pectoralis minor Innervation
Medial pectoral nerve c8-t1
37
Subclavius attachments
(Under clavicle) From 1st rib (manubrium) to inferior surface of Clavicle (groove)
38
Subclavius Actions
Depress clavicle Stabilizes sternoclavicular joint
39
Subclavius Innervation
Subclavian nerve c5-6
40
Where are Subclavius and Pectoralis minor
Deep to Pectoralis major
41
Name lateral muscles of scapulothoracic joint
Serratus anterior (boxers muscle)
42
Serratus anterior attachments
From lateral surface of ribs 1-9 to (fibres converge) medial/anterior border of scapula (medial edge subscapular fossa)
43
Serratus anterior Function
Primary protractor of scapula = strongest protractor (Creates scapulothoracic joint)
44
Serratus anterior Innervation
Long thoracic nerve c5-7
45
Clinical correlate Serratus anterior
Weakness or paralysis of Serratus anterior (like injury to long thoracic nerve) = leads to weakness in scapular protraction - when pushing against wall = seen as winged scapula on affected side = Serratus anterior cannot resist wall, retraction force from wall causes winged scapula
46
Name muscles of pectoral girdle - posterior
Trapezius Levator scapulae Rhomboid major and minor Latissimius dorsi
47
Trapezius attachments
Skull and vertebrae c7-t12 to spine and acromion of scapula and lateral 1/3 of clavicle
48
Trapezius Actions
Functionally = 3 parts with diff orientations Upper 1/3 = elevation (shrug), upwards rotation Middle 1/3 (or all parts) = retraction *recruiting all 3 also produces pure retraction Lower 1/3 = depression, upwards rotation (bc of configuartion of spine of scpaula and scapulothoracic joint = so upwards)
49
Trapezius Innervation
Accessory spinal nerve
50
Levator scapulae attachments
From cervical vertebrae to superior angle scapula
51
Levator scapulae Actions on scapula
Elevation Some retraction
52
Levator scapulae Innervation
C3-5
53
Rhomboid major and minor attachments
Cervical and thoracic spine to medial border of scapula (deep to trapezius)
54
Rhomboid major and minor Actions
Retraction and some elevation Downwards rotation (rhomboid major)
55
Rhomboid major and minor Innervation
Dorsal scapular nerve c5
56
Latissimus dorsi attachments
From lower thoracic vertebrae, tlf, ilium (pelvis) to intertubercular groove humerus
57
Latissimus dorsi Functions
Primarily a shoulder joint muscle but also crosses scapulothoracic joint = moves scapula too = downwards rotation, some retraction And depression
58
Latissimus dorsi Innervation
Thoracodorsal nerve c6-c8

ANAT 314 (27 decks)

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