The shoulder girdle Flashcards
What 3 bones is the shoulder girdle made from?
Clavicle
Scapula
Humerous
What joints are there at the shoulder ‘pectoral’ girdle?
- sternoclavicular joint - clavicle articulates laterally with the scapular
- acromioclavicular joint
What does the shoulder girdle do? Functionally for the body / movements?
- Provide a base for the limb to move
- Scapulohumeral rythum - maintain congurency of the glenoid fossa and humerous
- Elevation / protraction / retraction / depression
What shape is the clavicle? Why this shape?
S shaped
Starting at sternum and going laterally - curve is convex - cuves outwards / anterially
Then it becomes more concave…
This allows for force transmission to be disapated - if it was straight .. our bones would break loads
What shape is the clavicle?
S shaped
Starting at sternum and going laterally - curve is convex - cuves outwards / anterially
Then it becomes more concave…
This allows for force transmission to be disapated - if it was straight .. our bones would break loads [ie taping on patella tendon .. bends the tendon.. stronger.. same mechanism]
Articulating surfaces of the clavicle?
Medial - manubrium of the sternum [articular facet sits above 1st rib]
Laterally - the acromion
Sternoclavicular joint - articulation / structures and their associated functions / ligaements O/Is
synovial saddle joint
- ART: manubrium of the sternum and the clavicle bone
- Articular disc - (1) increased congruency, (2) nourishes joint, (3) shock absorption
- Ligaments
1. anterior sternoclavicular lig - O: margin of medial end of the clavical, I: sternum
2. Posterior sternoclavicular lig
3. Interclavicular ligament
4. Costalclavicular ligament O: under calvicule, I: 1st rib
All ___ Clavicular
Ant/post sternoclavicular = x2 [STERNOclavicular joint.. kinda obvious]
Inter clavicular ligament -
Cost aclavicular ligament -
Intermilan sign costa..
Acromioclavicular joint - what kind is it? / how many degrees of freedom / structures? ligaments - O/I and function ?
Acromioclavicular ligament –> Chrome =>
- Synovial plane
- 3 degrees of freedom
- Structures:
- May have a disc
- Joint capsule
Ligaments: Coracoidclavicular ligaments
- Conoid
- O: Base of the coracoid process
- I: Under lateral surface of clavicle - Trapizioid ligament
- O: caracoid process
- I: Under surface of clavicle
Connor (conoid) AL is trapped (trapuziod) (1) in coral (Coracoidclavicular ligaments) dealing chrome (acromioclavivular joint)
- These ligaments provide stability to clavicle as it attaches
Movements at shoulder girdle
- Elevation
- Depression
- Protraction
- Retraction
- Rotation
- Upward roation
- Downward rotation
Measuring ROM at the shoulder gridle, which landmarks?
Observe the:
Posterior view:
- Inferior angle of scap (if winging - the inf angle is lifted of the thorax) [can also have medial border winging]
- Glenoid fossa
Anterior view:
- line of the calvicle - is the lateral end above / in line or below the medial end (ideally the lateral end should be above to medial end - allows for scapular to be slightly upwardly rotated)
Lateral view:
- Rounding of the shoulder
- > Can be due to dominant pecs / weak posterior muscles (periscapular muscles)
Eyeball
Muscles and movements of shoulder girdle?
Elevation :
- Rhomboids
- Upper trapezius
- Levator scapulae
Depression:
- Lower trapezius
- Pec minor
- Latissimus dorsi
Retraction
- Rhomboids
- Trapezius (mid)
- Levator scapulae
Protraction
- Seratus anterior
- Pec minor
Upward rotation:
- Upper trapezius
- Seratus anterior
Downward rotation:
- Rhomboids
- Pec minor
- Levator scapulae
Trapezius slide cat A
Morph, O/I, actions, fibres?
Upper fibres - down / lat
Middle fibres - horizontal
Lower fibres - superiorially, lat
- O - occipital proterbance, nuchal line, upper portion of ligamentum nuchae, spinous process C7-T12
- I - lateral 1/3 of clavicle, acrominon process, spine of scapular
Occtopus (1) is protecting (1) a new child (2) watching UP when a ligar noob tubes (3) his spine (4).. then latvian x 3 arrive plying the clave (1) rhythm to try and heal the spine (2) with music from runeScape (2) while doing acro yoga (3)
Actions:
At C-spine: Cervical extension (when both sides contract), cervical side flexion (when one side contracts), scapular elevation, upward roation of scapular, retraction
Motor: accessory nerve (CN XI)
Motor/Sensory: ventral rami of spinal nerves C3-C4 (via cervical plexus)
At shoulder girdle: Depression, upward roation, elevation, retraction
Latissimus dorsi - Cat A
A pro spins..
Lat = latvian .. = latvian pro
1 x insertion
Morphology: flat, large, spiralised tendon
Fibres: up and laterally
O: Spinous processes of T6 through T12 and the lumbar vertebrae via the thoracodorsal fascia, posterior Iliac crest + Ribs 9-12 (last 3 ribs) + Inferior angle of scapula
I: Intertubercular groove of humerus
A latvian pro spills 6 / 12ths of a cup to Tea (1) onto a lump (2) by because Thor (3) closes a door on his face (3)..mixes it with a rib (+) and a angler fish (+) and then posts (4) it with cress (4) to an Inn (5) via a tube (5) full of hummus (5)
A: depression of shoulder girdle
(glenohumeral extension, medial rotation and adduction)
Nerve Thoracodorsal nerve (C6, C7, C8)
Observation of the shoulder girdle: ?
- Shoulder length
- Symmetry
- Muslce bulk
Bony palpation :
Spine of the scapula / provides attachment for ?
Model in high sitting
Spine runs upwards / laterally from vertebral border of scapula to point of the shoulder. Palpate upper and lower borders
Provides attachment for; Deltoid, Trapezius
