Sternum Flashcards
What does the sternum do?
anchors the anterior ends of paired ribs 1-7 via costal cartilage and protects the cardiovascular organs
What are the 3 parts the sternum is composed of?
manubrium, mesosternum/body and xiphoid process
What is the sternum formed of?
Sternebrae (which can fuse with age and aid in estimating age)
State the shape of the anterior and posterior surfaces?
Anterior surface is convex and posterior surface is concave
Where does the sternum articulate and with what?
Articulates with clavicle at clavicular notch and with rib cartilage at costal notches
What is the name of the indentation on the superior surface of the manubrium? (Hint: ends in notch)
Jugular notch
What ridges run across the body of the sternum?
Transverse ridges
What is the name of the indentation on the sides of the manubrium?
Costal notches
What 2 muscles come from the manubrium?
Sternocleidomastoid and sternohyoid muscles
Where does the sternocleidomastoid muscle run from and to?
From the manubrium and clavicle to the mastoid process on the temporal bone
What movement/action does sternocleidomastoid produce?
Head rotation and flexion
Where does the sternohyoid muscle run from and to?
From posterior manubrium to the hyoid
What movement/action does sternohyoid produce?
depresses hyoid
What muscle comes from the manubrium AND the body/mesosternum?
Pectoralis major muscle
Where does pectoralis major run from and to?
From manubrium, mesosternum and clavicle sideways to proximal humerus
