Lab Practical 2- Origin/Insertion/Function: SHARK

Question 1

Pectoral Extensors

Answer 1

Origin: scapular Process and adjacent Fascia

Insertion: Radials and ceratotrichia

Function: Elevates pectoral fin

Question 2

Pectoral Flexors

Answer 2

Origin: Coracoid bar

Insertion: Radials and ceratotrichia

Function: Depresses pectoral fin

Question 3

Adductor Mandibulae

Answer 3

Origin: Posterior part of the palatoquadrate cartilage

Insertion: Meckels cartilage

Function: closes the mouth

Question 4

Interhyoidius

Answer 4

Origin: Midventral raphe

Insertion: ceratohyal

Function: compresses gill pouches

Question 5

Intermandibularis

Answer 5

Origin: Meckles cartilage and fascia or the adductor mandibulae

Insertion: Midventral raphe

Function: Raises the floor of the mouth

Question 6

Preorbitalis

Answer 6

Origin: midventral surface of the chondrocranium

Insertion: Adductor mandibulae

Function: closes the mouth

Question 7

Cucullaris

Answer 7

Origin: dorsal longitudinal bundle fascia

Insertion: epibranchial cartilage and scapular process

Function: Elevates the gill arches and pectoral girdle

Question 8

Common coracoarcuals

Answer 8

Origin: coracoid bar

Insertion: coracohyoid

Function: opens the mouth

Question 9

coracomandibularis

Answer 9

Origin: fascia of common coracoarcuals

Insertion: Meckels cartilage

Function: opens the mouth

Question 10

Coracohyoid

Answer 10

Origin: common coracoarcuals

Insertion: basihyal

Function: opens the mouth

Question 11

Extrinsic eye muscle: Inferior Oblique

Answer 11

Origin: anterior end of orbit

Insertion: ventral side of eyeball

Function: rotates eye ventrally

Question 12

Extrinsic eye muscle: Inferior rectus

Answer 12

Origin: posterior end of orbit

Insertion: ventral side of eyeball

Function: rotates eye ventrally

Question 13

Extrinsic eye muscle: Lateral rectus

Answer 13

Origin: posterior end of orbit

Insertion: lateral side of eyeball

Function: rotates eye posteriorly

Question 14

Extrinsic eye muscle: Medial rectus

Answer 14

Origin: posterior end of orbit

Insertion: Medial side of eyeball

Function: rotates eye cranially

Question 15

Extrinsic eye muscle: superior oblique

Answer 15

Origin: Anterior end of orbit

Insertion: dorsal side of eyeball

Function: rotates eye dorsally

Question 16

Extrinsic eye muscle: Superior rectus

Answer 16

Origin: Posterior end of orbit

Insertion: dorsal side of eyeball

Function: rotates eye dorsally

Question 17

Epaxial Mytomes

Answer 17

Origin: Anterior myosepta

Insertion: Posterior Myosepta

Function: Lateral undulation of the body for swimming

Question 18

Hypaxial Myotomes

Answer 18

Origin: Anterior Myosepta

Insertion: Posterior myosepta

Function: Lateral Undulation, support viscera