Anterior Back Muscles Flashcards
(31 cards)
Deltoid Action
Flex arm at shoulder- Anterior Fibres
Posterior fibres “
Middle fibres-abductor arm
Deltoid Innervation
Axillary nerve
Deltoid Blood Supply
Deltoid- branch of thoracoacromial artery
Teres Major Action
Adducts shoulder
medially rotates arm
Teres Major Innervation
Inferior subscapular nerve
Teres Major Blood Supply
Sub-scapular artery
Supraspinatus (RC) Action
Abducts arm 0-15 deg
Assists deltoid 15-90 deg
Supraspinatus (RC) Innervation
Suprascapular nerve
Supraspinatus (RC) Blood Supply
Suprascpaular artery
Infraspinatus (RC) Action
Laterally rotates arm
Infraspinatus (RC) Innervation
Suprascapular nerve
Infraspinatus (RC) Blood Supply
Suprascapular artery
Subscapularis (RC) Action
Medially rotates arm
Subscapularis (RC) Innervation
Upper/Lower subscapular nerves
Subscapularis (RC) Blood Supply
Sub-scapular branch of axillary artery
What muscles in the back are EXTRINSIC
1) Trapezius
2) Lattisimus Dorsi
3) Levatator Scapulae
4) Rhomboid Major
5) Rhomboid minor
Trapezius Action
FIBRES
Upper- Elevate scapula+ rotate during adbuction of arm
Middle- Retract scapula
Lower-Pull scapula inferiorly
Trapezius Innervation
Accessory nerve
Trapezius Blood Supply
Transverse cervical artery
Lattisimus Dorsi Action
Extends
Adducts
Medially rotates upper limb
Lattisimus Dorsi Innervation
Thoracodorsal nerve
Lattisimus Dorsi Blood Supply
Thoracordorsal artery
Levatator Scapulae Action (Deep)
Elevates Scapula
Levatator Scapulae Innervation (Deep)
Dorsal Scapular nerve
