Thoracic Locomotion Pt. 1

Structures of importance

Cutaneous truni/ Preputial muscle

Platsyma

Thoracolumnar fascia

Superficial facia/external jugular

Deep fascia / corotid sheath

Dorsal median raphe

Preputial Muscle

only found in males, surrounds the penis

Platysma

Head & neck level cutaneous trunci

Thoracolumbar fasci

Covers back muscle group

Superficial fascia / external jugular

Fascia covering the jugular vein & artery

Deep fascia / carotid sheath

Connective tissue sheath surrounding the carotid artery, internal jugular vein, and vagus nerve in the neck.

Dorsal median raphe

Covers spinous process of vertebrae

Phases of Locomotion (progression)

Retraction (recovery)

Protraction (advance)

Retraction

Beginning of stride

all joints flexed

Protraction

End of stride

all joints are extended

Extrinsic muscles

during movement they control the progression of the body

Why are direct bone attachments weak?

they lack the support of tendonsand ligaments that typically enhance stability and strength.

Extrinsic muscle with no tendinous attachment

serratus ventralis; when ruptured the scapula will be permanently elevated dorsally

What muscles are effected by scapular fractures?

Trapezius, omotransversarius, & deltoidus

Suprficial pectoral Action

Adduct when limb is free; prevent abduction when grounded

Bone to Muscle attachment

Very weak when no tendon present; if serratus ventralis ruptures the scapula will be permanently elevated

Trapezius action

Elevate the scapula

Abduct the limb

Omotransversarius action

Advance the limb

Move neck laterally

lymph node located medially

Brachiocephalicus action

Advance the limb

Move head and neck laterally/down when both sides contract

Extend the shoulder

Latissimus dorsi action

Draw the freelimb backwards - digging muscle

Flex the shoulder

Superficial pectoral action

Adduct limb when free

Prevent abducton when weight baring

Rhombodieus action

Elevate and adduct the scapula

Serratus ventalis action

Sling & support the trunk

Deep pectoral action

Adduct the limb when free

Prevent abduction when weight baring

Intrinsic muscles

Extend between bones of the limb

O & I confined to appendicular skeleton

Grouped into acton on joints

Flexion angle

The flex range of the joint; if increased angle from resting > extension; if decreased angle from resting > flexion

Suspraspinatus action

Extend and stabilize the shoulder

Infraspinatus action

Stabilizes shoulder joint; support

Bursa present

IM injections given in belly

Subscapularis & Coracobrachialis

Stabilize & support shoulder joint

Co-lateral tendons present

Deltoideus action

Flex the shoulder

Teres major & minor action

Flex the shoulder