Complex Shoulders
Connects the lateral surface of ribs 1-9 and the anterior aspect of the vertebral boarder of the scapula
What is the serratus anterior muscle?
Its actions are elbow flexion and supination
What is the biceps brachii?
This muscle allows breathing at rest, but it can also be used to regulate pressure for trunk stabilization if necessary
What is the diaphragm?
The right internal and the left external oblique create this motion
What is right trunk rotation?
The conceptual reason that throwing and kicking activities use a wind-up phase to gain velocity
What is the stretch shorten cycle?
Upper trapezius, lower trapezius and serratus anterior create this coupled motion
What is upward rotation?
This nerve innervates the bicpes brachii, brachialis, and coracobrachialis
What is the musculocutaneous nerve?
One potential reason you may hold your breath when lifting is to improve this
What is trunk or postural stability?
With the facet joints located in the sagittal plane, these bones are made for flexin'
What is the lumbar spine?
Back in neutral, use your legs and hold that box close
What are proper lifting mechanics?
Compression and depression, centering the humeral head to the glenoid fossa
What is the role of the rotator cuff?
This muscles' distal tendinous attachment splits to allow the DIP flexor muscle to pass through it
What is the flexor digitorum superficialis?
Using pectoralis major/minor, transverse abdominis or abdominal obliques, or serratus anterior for breathing is an example of this concept.
What is accessory respiratory muscles OR role reversal?
The cervical spine, completing both side bending and rotation at the same time, is an example of this type of motion
What are coupled motions?
The glenohumeral external rotator muscles, infraspinatus and teres minor, eccentrically contract during this phase of throwing to slow down the arm
What is the deceleration or follow-through phase?
For every 2 degrees of elevation of the humerus, the scapular upwardly rotates 1 degree
What is the concept of scapulohumeral rhythm?
This type of grasp is utilized to carry heavy plates and trays
What is a lumbrical grip?
The active phase drawing in air
What is inhalation?
This muscle acts as the body's "internal back brace"
What is the transverse abdominis?
Poor body mechanics with repeated lifting with combined flexion and rotation of the lumbar spine can be the root cause of this pathology
What is a herniated vertebral disc?
An overuse condition in which the scapula does not complete upward rotation correctly to clear the acromion process from compressing the soft tissue structures of the shoulder
What is impingement syndrome?
The supinator, extensor carpi radialis brevis and longus, extensor carpi ulnaris, and extensor digitorum's proximal attachment
What is the lateral epicondyle of the humerus?
Exhalation occurs with the increase in this area's pressure due to the relaxation of the diaphragm
What is the thoracic cavity?
The muscles that are constantly "on" due to our anteriorly located center of gravity (well, that is until we are in full trunk flexion)
What are the paraspinal or erector spinae muscles?
The stabilizing sequence of muscle activation when reaching for my favorite textbook overhead