Post natal development of canine caudal cervical vertebrae

Area of Science:

• Veterinary Anatomy
• Developmental Biology
• Comparative Osteology

Background:

• Understanding canine vertebral development is crucial for diagnosing congenital and developmental orthopedic conditions.
• Detailed knowledge of cervical vertebrae (C5-C7) ossification patterns in puppies provides a baseline for growth assessment.

Purpose of the Study:

• To document the gross, histological, and radiographic morphology of postnatal ossification in canine cervical vertebrae (C5-C7).
• To determine the timeline of ossification center appearance, fusion, and closure in puppy cervical vertebrae.
• To measure neural canal dimensions and assess their developmental changes.

Main Methods:

• Gross examination of 51 crossbred puppies (birth to 12 weeks).
• Histological analysis of vertebral tissues.
• Radiographic imaging to visualize ossification centers and bone fusion.
• Measurement of neural canal sagittal diameters.

Main Results:

• At birth, puppies had two ossification centers: one in the vertebral body and one in the pedicle base.
• Secondary ossification centers appeared in vertebral body epiphyses by one month, with closure signs by two months.
• Neural arch ossification initiated from a single pedicle center, with lamina fusion by one month.
• Neural canal sagittal diameter differences were minimal (≤1 mm).

Conclusions:

• Canine cervical vertebrae C5-C7 exhibit distinct postnatal ossification timelines.
• Post-one month, neural canal shape is primarily determined by physeal changes and intramembranous ossification remodeling.
• This study provides essential data for understanding normal canine vertebral development.