. Chordate morphology. Morphology (Animals); Chordata. intertemporal hyomandibula-- sclerotrc plate porietal supraorbital nasal capsule^ „?;?! medial rostral, lateral rostral^ extrascapular series posttemporal suprapreopercle. Figure 5-1. Lateral view of the head skeleton of the salmon. The myodome is a cavity between the base of the cranium and the parasphenoid. The prootics meet above this space, and form part of its lateral wall. This cavity contains the poste- rior parts and the areas of origin of the external, internal, and inferior rectus muscles of the eye. The myodome is small in the c
. Chordate morphology. Morphology (Animals); Chordata. intertemporal hyomandibula-- sclerotrc plate porietal supraorbital nasal capsule^ „?;?! medial rostral, lateral rostral^ extrascapular series posttemporal suprapreopercle. Figure 5-1. Lateral view of the head skeleton of the salmon. The myodome is a cavity between the base of the cranium and the parasphenoid. The prootics meet above this space, and form part of its lateral wall. This cavity contains the poste- rior parts and the areas of origin of the external, internal, and inferior rectus muscles of the eye. The myodome is small in the cod and does not extend below the level of the basis cranii. The salmon is peculiar in having an ante- rior myodome, a midline chamber extending forward nearly to the tip of the rostrum (Figure 5-5). The hyomandibula articulates with the sphenotic and pterotic parts of the otic capsule wall. It has an opercular process extending posteriorly, as well as a process extending out to the preopercle. The body of the bone is perforated by the hyomandibular branch of the seventh cranial nerve. The distal end articulates anteriorly with the symplectic and posteriorly with the interhyal; both of these joints are synchondroses. The interhyal is a small bony rod between the hyomandibula and the posterior end of the triangular ceratohyal posterior. The ceratohyal is divided into anterior and posterior parts; in the cod or perch (Figure 5-3 D), these are joined internally by straps of bone, which meet along a deeply intcrdigitating suture line. The hypohyal is made up of dor- sal and ventral parts, synchondrally joined. The hypohyals join at the midline where the dorsal portion is attached to the midline basihyal. A urohyal extends ventroposteriorly as a thin midline plate. In the salmon there is an anteriorly projecting, tooth-bearing, entoglossal attached to the basi- hyal. Behind the hyoid arch are four branchial arches. With the exception of the first, each of these has four segme
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