#Rogue #Anatomy #Pectoralis #Major #Muscle #Neuroanatomy #Pec #Massage #Techniques #Exercises
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It’s Rogue Anatomy time! This go around we are diving deep on PECTORALIS MAJOR. A not to early readers. This section is still a mess. I’m working on getting time codes and more polish information in this space.
So just be aware…it’s a pile of crap right now.
Chapter Time Codes
00:00 Intro
00:59 Etymology
02:00 Basic Structure (2 heads or 3?)
03:00 Origins and Insertions
05:39 Tendon Structure and Size
07:12 Motor Nerves
10:52 Cutaneous Nerves
14:06 Motions and Actions
17:52 Injuries/Pathologies/Surgical Issues
20:32 Tendon Ruptures / Muscle Tears
23:33 Techniques for Working with Clients
30:37 Dermoneuromodulation / Nerve Techniques / Nerve Glides / Nerve Flossing
33:34 Exercises: 3 VITAL motions for pectoralis major / Weight Training or Rehab
Expanded Information in text form.
Two-Headed Muscle Sternocostal Head (larger) and clavicular head (smaller).
Fan Shaped Convergent Type Muscle
Nerve Supply – C5-T1
Dual Motor Innervation
Clavicular Head – Lateral Pectoral Nerve
Sternal Head – Medial Pectoral Nerve
Electromyography suggests that it consists of at least six groups of muscle fibers that can be independently coordinated by the central nervous system.
Skin Innervation is derived from cutaneous thoracic nerves (intercostals) with some of the superior portion being handled by the supraclavicular nerves arising from the cervical vertebrae.
Origin:
Complex, Medial half of the clavicle, Manubrium and body of the sternum, superior six costal cartilages, AND the aponeurosis of the external abdominal oblique muscle
Insertion:
Crest of the greater tubercle of the humerus. Complex often fused or indistinguishable from surrounding tissues.
Tendon is 5cm Average Width at the attachment site.
COOL TENDON INFORMATION (wikipedia and Complete Anatomy)
This tendon consists of two laminae, placed one in front of the other, and usually blended together below:
The anterior lamina, which is thicker, receives the clavicular and the uppermost sternal fibers. They are inserted in the same order as that in which they arise: the most lateral of the clavicular fibers are inserted at the upper part of the anterior lamina; the uppermost sternal fibers pass down to the lower part of the lamina which extends as low as the tendon of the Deltoid and joins with it.
The posterior lamina of the tendon receives the attachment of the greater part of the sternal portion and the deep fibers, i. e., those from the costal cartilages.
These deep fibers, and particularly those from the lower costal cartilages, ascend the humerus insertion higher, turning backward successively behind the superficial and upper ones, so that the tendon appears to be twisted. The posterior lamina reaches higher on the humerus than the anterior one, and from it an expansion is given off which covers the intertubercular groove of the humerus and blends with the capsule of the shoulder joint.
From the deepest fibers of this lamina at its insertion, an expansion is given off which lines the intertubercular groove, while from the lower border of the tendon a third expansion passes downward to the fascia of the arm.
Motion:
Adduction of the humerus in the transverse plane
Medial Rotation of the humerus
Shoulder Flexion (clavicular head, arm raise)
Shoulder Extension (sternal head, lowers arm)
Shoulder Depression (sternocostal head, depressing clavicle)
Shoulder Adduction (pull-down, working with latissimus dorsi)
Conditions and Concerns
Poland Syndrome
Missing or Damaged
Surgical Removal
Working with this Muscle
Movement is key
Nerve Flossing to address deeper nerves. Brachial plexus/Thoracic Outlet.
Skin stretching, dermoneuro modulation techniques for more superficial nerves. Cross Fiber Friction, vibration or vibration guns while moving the joint may also be beneficial.
Optimal loading is done in three positions and should include crossbody adduction! This can be achieved by lowering the resistance and using cable machines or dumbbells.
Links, studies, and other information.
Bones as part of the stress response:
https://www.eurekalert.org/pub_releases/2019-09/cp-bsa090519.php
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