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Appendicular Skeleton - Human Anatomy - Lecture Notes, Study notes of Anatomy

Alagappa UniversityAnatomy

Appendicular Skeleton, Pectoral Girdles, Upper Limbs, Pelvic Girdle, Lower Limbs, Axial Skeleton, Acromial Extremity, Conoid Tubercle, Glenoid Cavity, Infraspinous Fossa are some points f this lecture. This lecture handout was provided by lecturer in Human Anatomy class. Important terms are bold in this handout. Few terms of the lecture are given above.

Typology: Study notes

2011/2012

Uploaded on 12/24/2012

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A. Introduction
1. The appendicular skeleton contains 126 bones that form:
i. two pectoral (shoulder) girdles
ii. two upper limbs
iii. one pelvic (hip) girdle
iv. two lower limbs
B. Pectoral (Shoulder) Girdle
1. The two pectoral girdles attach the bones of the upper limbs to the axial skeleton.
2. Each pectoral girdle consists of two bones (each having specific surface markings):
i. Clavicle (collarbone)
a. sternal extremity (contributes to the sternoclavicular joint)
b. acromial extremity (contributes to the acromioclavicular joint)
c. conoid tubercle
d. costal tuberosity
ii. Scapula (shoulder blade)
a. spine
b. body
c. acromion
d. glenoid cavity (fossa)
e. medial (vertebral) border
f. lateral (axillary) border
g. superior border
h. inferior angle
i. superior angle
j. scapular notch
k. coracoid process
l. supraspinous fossa
m. infraspinous fossa
n. subscapular fossa
C. Upper Limb (Extremity)
1. Each upper limb contains 30 bones:
i. Humerus is located in the arm;
a. head
b. anatomical neck
c. greater tubercle
d. lesser tubercle
e. intertubercular sulcus
f. surgical neck
g. body (shaft)
h. deltoid tuberosity
i. capitulum
j. radial fossa
k. trochlea
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A. Introduction

  1. The appendicular skeleton contains 126 bones that form: i. two pectoral (shoulder) girdles ii. two upper limbs iii. one pelvic (hip) girdle iv. two lower limbs

B. Pectoral (Shoulder) Girdle

  1. The two pectoral girdles attach the bones of the upper limbs to the axial skeleton.
  2. Each pectoral girdle consists of two bones (each having specific surface markings ): i. Clavicle (collarbone) a. sternal extremity (contributes to the sternoclavicular joint ) b. acromial extremity (contributes to the acromioclavicular joint ) c. conoid tubercle d. costal tuberosity ii. Scapula (shoulder blade) a. spine b. body c. acromion d. glenoid cavity (fossa) e. medial (vertebral) border f. lateral (axillary) border g. superior border h. inferior angle i. superior angle j. scapular notch k. coracoid process l. supraspinous fossa m. infraspinous fossa n. subscapular fossa

C. Upper Limb (Extremity)

  1. Each upper limb contains 30 bones: i. Humerus is located in the arm; a. head b. anatomical neck c. greater tubercle d. lesser tubercle e. intertubercular sulcus f. surgical neck g. body (shaft) h. deltoid tuberosity i. capitulum j. radial fossa k. trochlea

l. coronoid fossa m. olecranon fossa n. medial epicondyle o. lateral epicondyle ii. Ulna is located on the medial aspect of the forearm; its shaft is connected to the radius by the interosseous membrane a. olecranon (or olecranon process ) b. coronoid process c. trochlear notch d. ulnar tuberosity e. radial notch f. head g. styloid process iii. Radius is located on the lateral aspect of the forearm; a. head and neck b. radial tuberosity c. styloid process d. ulnar notch iv. 8 carpal bones are located in the carpus (wrist); a. theproximal row contains (from lateral to medial position):

**- scaphoid

  • lunate
  • triquetrum
  • pisiform** b. the distal row contains (from lateral to medial position): **- trapezium
  • trapezoid
  • capitate
  • hamate** v. metacarpal 5 bones, numbered I to V (from lateral to medial position), are located in the metacarpus (palm); each bone consists of: a. proximal base b. intermediate shaft c. distal head vi. 14 phalanges are located in the digits; each phalanx consists of: a. base b. shaft c. head The thumb) has a ( pollex proximal phalanx and a distal phalanx. The other four fingers each have proximal, middle, and distal phalanges.

D. Pelvic (Hip) Girdle

  1. The pelvic girdle provides a strong and stable support for the vertebral column and viscera.
  2. The pelvic girdle consists of two coxal bones (hip bones) that meet anteriorly at the pubic symphysis.
  3. Each coxal bone of a newborn consists of three bones which eventually fuse into one bone; these three bones (and their important surface markings ) are: i. superior ilium consists of a superior ala and an inferior body a. iliac crest b. anterior superior iliac spine c. anterior inferior iliac spine

F. Comparison of Pectoral and Pelvic Girdles

  1. Structural differences include: i. the pectoral girdles do not articulate directly with the spine ii. the glenoid fossae are shallow while the acetabula are deep iii. the pectoral girdles offer more mobility while the pelvic girdle offers more strength

G. Lower Limb (Extremity)

  1. Each lower extremity contains 30 bones: i. Femur (thighbone) is located in the thigh; a. body (shaft) b. head c. fovea capitis d. neck e. greater trochanter f. lesser trochanter g. intertrochanteric line h. intertrochanteric crest i. gluteal tuberosity j. linea aspera k. medial condyle l. lateral condyle m. medial epicondyle n. lateral epicondyle o. intercondylar fossa p. patellar surface ii. Patella (kneecap) is a sesamoid bone; a. base b. apex c. articular facets iii. Tibia (shin bone) is the larger and medial bone in the leg (and it is connected to the fibula by the interosseous membrane): a. lateral condyle b. medial condyle c. intercondylar eminence d. tibial tuberosity e. anterior border (crest) f. medial malleolus g. fibular notch iv. Fibula is the lateral bone in the leg: a. head b. lateral malleolus v. The tarsus (ankle) consists of 7 tarsal bones: a. talus b. calcaneus (heel bone) c. cuboid d. navicular e. first (medial) cuneiform f. second (intermediate) cuneiform g. third (lateral) cuneiform vi. The metatarsus consists of 5 metatarsal bones, numbered I to V from the medial to lateral position; each bone consists of:

a. base b. shaft c. head vii. 14 phalanges are located in the toes; each phalanx consists of: a. base b. shaft c. head The big toe ( hallux ) has a proximal phalanx and a distal phalanx. The other four toes each have proximal, middle, and distal phalanges. viii. The bones of the foot are arranged to form two nonrigid arches : a. longitudinal arch (with medial and lateral parts ) b. transverse arch These arches enable the foot to support the weight of the body, provide an ideal distribution of body weight over tissues of the foot, and provide leverage while walking.

H. Development of the Skeletal System

  1. All skeletal tissue arises from mesenchymal cells that are derived from mesoderm.
  2. In some cases, bones develop via intramembranous ossification; in other cases, bones develop via endochondral ossification.
  3. The skull develops from mesenchyme and consists of 2 major portions: i. neurocranium , which consists of the cartilaginous neurocranium and the membranous neurocranium ii. viscerocranium , which consists of the cartilaginous viscerocranium and the membranous viscerocranium
  4. The vertebrae are derived from the sclerotomes of somites.
  5. Processes from the vertebrae develop into ribs; the sternum develops from mesoderm in the ventral body wall.
  6. The skeleton of the limbs originates at upper and lower limb buds , which consist of mesenchyme covered by ectoderm.
  7. Distal segments of the limb buds develop into hand plates and foot plates.
  8. Ossification progresses at a specific pace throughout the weeks of fetal development.

I. Key Medical Terms Associated with the Appendicular Skeleton

  1. Students should familiarize themselves with the glossary of key medical terms.