Lecture 3 Flashcards
What are the contents of the deltopectoral triangle?
Cephalic vein, deltoid branch of thoracoacromial trunk
What are the boundaries of the deltopectoral triangle
Superior– clavicle
Medial– pectoralis major
Lateral– deltoid
Boundaries of the axilla
Apex–1st rib and clavicle and superior edge of subscapularis
Base– skin and subcutaneous tissue and axillary fascia.
Anterior– pectoralis major and minor
Posterior– subscapularis
Superior:teres major
Inferior: latissimus Doris
Medial– thoracic wall and serrated anterior
Lateral– intertubercular groove of humerus
Contents of the axilla
Lymph vessels and lymph nodes, axillary artery, axillary vein, brachial plexus.
Where is the subclavian groove
Inferior side of clavicle.
What does the root of the scapula do?
Attaches the remainder of the scapula under the spine
What runs with the axillary nerve
The posterior circumflex humeral artery.
Breasts go from ribs?
2-6
Describe the fascia of the pectoral region
Once the pectoralis major is reflected you see the external abdominal aponeurosis and you see the pec minor. Fascia (superior) above the minor is called the costocoracoid membrane. Under (inferior) is the suspensory ligament of the axilla. This is called the clavipectoral fascia.
The costocoracoid fascia is pierced by what nerve
Lateral pectoral nerve
What ribs does the sternum articulate with
Ribs 1-7 forming sternocostal joints.
Where is the sternum with respect to the thoracic vertebra
Rib 1 is on TV1 and manubrium is in front of tv3 and tv4. So the body is roughly in front of TV 5-9 and the xiphoid around TV 10
True false and floating ribs
True: ribs 1-7. Costal cartilages attach directly to the sternum.
False: ribs 8-10costal cartilages are joined to that of the rib immediately superior, ultimately attaching them indirectly to the sternum.
Floating: ribs 11-12. Costal cartilages are rudimentary and not attached to the sternum. They end in abdominal musculature.
What ribs are typical ribs
Ribs 3-9
Describe when the sternocostal and clavicular head of the pec major are active
Sternocostal head is activated when doing pull ups or chin ups (when you have your arm flexed against resistance your clavicular head will be active, when you are flexed and try to push down on the table to do dxtension you feel the sternocostal head firing.
What happens when your long thoracic nerve is injured
You have winging. This is when the medial border of the scapula protrudes posteriorly. This is different from when the rhomboid as are weak because if that’s the case the scapula will laterally rotate.
___ passes anterior to the clavicle immediately deep to the platysma
Supraclavicular nerve
What is the distribution of the Supraclavicular nerve
Sensory– skin over the clavicle and the superiolateral aspect of the pec major.
Distribution of the ventral rami c5 and intercostal, t2-t12
Sensory: anterior aspect of the thorax. They create banding patterns.
Origin of the axillary artery
Continuation of the subclavian artery at the first rib. At the edge of the first rib it’s the axillary artery now.
Course of the axillary artery
Divided by the pec minor in three parts; proximal, deep, and distal to pec minor. It ends at the inferior border of the teres major and becomes the brachial artery. 1 branch in proximal, 2 branches in deep, and 3 branches in distal
Scapular anastomoses: arterial communications exist around the scapula between what vessels?
Supra scapular
Dorsal scapular
Subscapular: circumflex scapular and thoracodorsal
Intercostal
Vein origins are ____
Distal and not proximal.
