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VBSC 421 Lab Quiz 4 Muscular System and Joints.
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VBSC 421 Lab Quiz 4 Muscular System and Joints.
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VBSC 421 Lab Quiz 4 Muscular Systemand Joints
Myomere (shark) - ANS-series of muscular segments
Myosepta (shark) - ANS-sheets of connective tissue separating myomeres
Horizontal septa (shark) - ANS-myomeres divided into epaxial and hypaxial portions by
this sheet of connective tissue
Epaxial (shark) - ANS-dorsal muscles
*- extensors/abductors*
Hypaxial (shark) - ANS-ventral muscles
*- flexors/adductors*
Pectoral abductor muscle - ANS-"extensor" muscle
- outside of fin
Pectoral adductor muscle - ANS-"flexor" muscle
- underside of fin (C)
Adductor mandibulae - ANS-jaw muscle of the shark; provides bite strength (C)
Pectoantebrachialis - ANS-Origin: Manubrium (sternum)
Insertion: Proximal antebrachium
Action: adducts forelimb
Pectoralis major - ANS-Origin: Cranial portion of the sternum
Insertion: shaft of humerus
Action: adducts forelimb
Pectoralis minor - ANS-Origin: sternum
Insertion: humerus
Action: adducts forelimb
Xiphihumeralis - ANS-Origin: *median raphe over the xiphoid process*
Insertion: humerus
, Action: adducts forelimb
External oblique - ANS-"Cowboy muscle"
Insertion: linea alba
Action: compresses abdomen
Internal oblique - ANS-Insertion: linea alba
Action: compresses abdomen
Transversus abdominus - ANS-Insertion: Linea alba
Action: compresses abdomen
Rectus abdominus - ANS-Origin: pubis
Insertion: proximal sternum and costal cartilage
Action: flexion of the trunk
Clavotrapezius - ANS-Origin: Lambdoidal ridge, mid dorsal raphe
Insertion: clavicle (raphe)
Action: protracts the forelimb
Clavobrachialis (clavodeltoid) - ANS-Most anterior on forelimb
Origin: Clavicle (raphe)
Insertion: proximal ulna (medial, near elbow)
Action: protracts the forelimb
Acromiotrapezius - ANS-Origin: mid dorsal line
Insertion: metacromion and spine of scapula
Action: adducts and stabilizes the scapula
Spinotrapezius - ANS-Origin: mid dorsal line and thoracic vertebrae
Insertion: over the spine of the scapula
Action: pulls scapula caudally (retraction)
Latissimus dorsi - ANS-Origin: spinous processes of caudal, thoracic, and lumbar
vertebrae
Insertion: medial surface of the humerus
Action: retracts the forelimb
Serratus ventralis - ANS-Origin: surface of ribs and cervical vertebrae
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