Skeletal System Thorax Anatomy Bony Thorax Chest Part

Skeletal System Thorax Anatomy

Bony Thorax • Chest – Part of vertebrate, ribs, sternum – Protects organs – Provides support

Sternum • Flat bone • 3 important markings (jugular notch, sternal angle, xiphisternal joint)

Ribs • 12 pairs • Attach directly to sternum true ribs (7 pairs) • Attach indirectly to sternum false ribs (5 pairs) • No anterior attachment to sternum Floating ribs

Appendicular Skeleton • Limbs and their girdles • Carry out movements

Pectoral (Shoulder) Girdle • Clavicle • Scapula

Pectoral (Shoulder) Girdle • Clavicle – Collarbone – Anchors muscles – Not very strong • Can damage subclavian artery • Sensitive to muscle pull

Pectoral (Shoulder) Girdle • Scapula – Shoulder blade

Upper Limb (Arm) – Tubercle (where muscles attach) • Humerus – Longest, largest, bone of upper limb – Supracondylar ridges- ulnar nerve runs behind it (Funny bone)

Forearm • Contain ulna and radius • Connected by a membrane • Form an “X”

Ulna • Longer of the forearm bones • Forms the elbow joint

Radius • Anchors the biceps • Major forearm bone with wrist joint – When radius moves…the hand moves

Hand • Includes the carpus (wrist) and phalanges (fingers)

Carpus • 8 bones • Very flexible • Scaphoid, lunate, triquetral, pisform, trapezium, trapezoid, capitate, hamate – Sally left the party to take Cathy home

Carpal Tunnel Syndrome • Carpus is concave and a ligament is above the cavity – Forms a tunnel • Nerves and tendons crowd this tunnel • Overuse cause them to swell compresses nerve/causes numbness

Metacarpus (Palm) • Small, long bones are not named • Form the knuckles when you make a fist • Metacarpal 1 thumb

Phalanges • • Fingers, digits Thumb pollex Third finger is longest in most people Except for thumb each finger has 3 phalanges