131%2C+T10%2C+Ch8+Appendicular+Skeleton

131%2C+T10%2C+Ch8+Appendicular+Skeleton - 9/13/11 1...

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Unformatted text preview: 9/13/11 1 Appendicular Skeleton Chapter 8 IB 131 Lecturer: Tom Carlson The Appendicular Skeleton Pectoral girdle Attaches the upper limbs to the trunk Pelvic girdle Attaches the lower limbs to the trunk Upper and lower limbs differ in function Share a similar structural plan Clavicle Acromio- clavicular joint Scapula (a) Articulated pectoral girdle Articulated Pectoral Girdle Figure 8.1a PLAY Shoulder The Pectoral Girdle Consists of the clavicle and the scapula Pectoral girdles do not quite encircle the body completely Clavicles extend horizontally across superior thorax Only clavicle articulates with the axial skeleton Medially--- sternal end of each clavicle articulates with the manubrium and first rib Medially near sternal end is the tuberosity for costoclavicular ligament Laterallythe acromium ends of the clavicles join the scapulae at the acromioclavicular joint Scapulae do not join each other or the axial skeleton Clavicles Figure 8.1b, c Acromial (lateral) end (b) Right clavicle, superior view Posterior Sternal (medial) end Anterior Acromial end Trapezoid line Conoid tubercle Anterior Posterior Sternal end (c) Right clavicle, inferior view Tuberosity for costoclavicular ligament The Pectoral Girdle Provides attachment for many muscles that move the upper limb Girdle is very light and upper limbs are mobile Socket of the shoulder joint ( glenoid cavity of scapula ) is shallow and provides for good flexibility , but relatively poor stability 9/13/11 2 Structures of the Scapula Figure 8.2c Coracoid process Glenoid cavity (c) Right scapula, lateral aspect Infraglenoid tubercle Supraglenoid tubercle Supraspinous fossa Subscapular fossa Inferior angle Acromion Infraspinous fossa Spine Supraspinous fossa Infraspinous fossa Subscapular fossa Posterior Anterior Structures of Scapula Clavicle Acromio- clavicular joint Scapula (a) Articulated pectoral girdle Articulated Pectoral Girdle Figure 8.1a PLAY Shoulder PLAY Shoulder Clavicles Provide attachment for muscles Hold the scapulae and arms laterally Transmit compression forces from the upper limbs to the axial skeleton Clavicle Acromio- clavicular joint Scapula (a) Articulated pectoral girdle Articulated Pectoral Girdle Figure 8.1a PLAY Shoulder Scapulae Lie on the dorsal surface of the rib cage Located between ribs 27 Have three borders Superior Medial (vertebral) Lateral (axillary) Have three angles Lateral, superior, and inferior Superior angle Medial border Coracoid process Suprascapular notch Acromion Glenoid cavity at lateral angle Lateral border Infraspinous fossa Spine (b) Right scapula, posterior aspect Supraspinous fossa Structures of the Scapula Figure 8.2b 9/13/11 2 Structures of the Scapula Figure 8.2c Coracoid process Glenoid cavity (c) Right scapula, lateral aspect Infraglenoid tubercle Supraglenoid tubercle Supraspinous fossa Subscapular fossa Inferior angle Acromion Infraspinous...
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This note was uploaded on 10/14/2011 for the course IB 131 taught by Professor Carlotom during the Spring '11 term at City College of San Francisco.

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131%2C+T10%2C+Ch8+Appendicular+Skeleton - 9/13/11 1...

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