Pectoral and Scapular Regions Flashcards
How many muscles make up the pectoral region
4
what muscle moves the clavicle (pectoral region)
subcalvius - C5,6
What muscle moves the humorous (pectoral region)
pectoralis major - medial (C8,T1) and lateral pectoral (c5,6,7)
what muscles move the scapula (pectoral region)
pectoralis minor - medial pectoral nerve (C8,T1)
serrates anterior - long thoracic nerve (C5,6,7)
pectoralis major
2 heads
adducts
medially rotates
pectoralis minor
stabilises/depresses scapulas
subclavius
stabilises/depresses clavicle
serratus anterior
protracts
prevents winging scapular rotation
what muscle moves the humorous (extrinsic back muscles)
lattissimus dorsi - thoracodorsal nerve (C6,7,8)
what muscles move the scapula (extrinsic back muscles)
trapezius - spinal accessory
rhomboids (major and minor) - dorsal scapular nerve (C3,4)
levator scapula - cervical nerves (C3,4) dorsal scapular (c4,5)
latissimus dorsi
action at GH joint
extends
adducts
medially rotates
prime mover in elevation/depression of scapula
upper trapezius and gravity
prime mover in protraction and retraction
serratus anterior and middle trapezius
prime mover for upward rotation and downward rotation
upper trapezius and serratus anterior
latissimus dorsi
nerves that supply the deltoid
axillary nerve (C5,6)
nerves that supply the tires major
lower sub scapular nerve (c5,6)
what are the three functional parts of the deltoid
anterior (clavicular) -flexion -medial rotation middle (acromial) -abduction posterior (spinal) -extension -lateral rotation
function of trees major
adduction and medial rotation
what are the three muscles of the rotator cuff - holds the humeral head in the glenoid fossa
– Supraspinatus – Suprascapular Nerve (C4,5,6)
– Infraspinatus – Suprascapular Nerve (C5,6)
– Teres Minor – Axillary nerve (C5,6)
– Subscapularis – U and L Subscapular nerves (C5,6,7)
actions of the rotator cuff
initial abduction (15 degrees) SUPRASPINATUS external rotation INFRASPINATUS internal rotation SUBSCAPULARIS
Elements of stability of the glenohumeral joint
- 3 insert on greater tuberosity
- 1 On to lesser tuberosity
- Surround humeral head
- Supraspinatus runs beneath acromion
- Subacromial bursa • Inflation
- impingement
what are the three arm muscles which cross the GH JOINT
– Long head of Biceps Brachii
– Corocobrachialis
– Long head of triceps
what fascia is around the pectoral minor
clavipectoral
Infraspinatus and
Supraspinatus fascia
- Origin of the muscles
* Really dense
spaces in the scapular region
– Connect axilla to posterior of limb
– Quadrangualr space
– Triangular Space upper
– Triangular Interval lower
what are the contents of the axilla
- Axillary vessels
- Brachial Plexus
- Cords and branches • Axillary Sheath
- From prevertebral fascia
what are the 5 groups od lymph nodes
anterior lateral posterior central apical
borders of the quadrangular space
teres minor
teres major
humorous
long head of triceps
contents of the scapular Spaces
• Posterior Circumflex
Humeral Artery
• Axillary nerve
• (Surgical neck of Humerus)
Triangular space (upper triangular space) borders
- Teres Minor
- Teres Major
- Long Head of Triceps
Triangular space (upper triangular space) contents
- Circumflex Scapular artery
* Leads to scapular anastomosis
• Triangular interval (lower triangular space) borders
- Lateral head of Triceps
- Long Head of Triceps
- Teres Major
Triangular interval (lower triangular space) contents
- Radial nerve
- Profunda Brachii artery
- Leads to spiral groove
