Manibular growth in the rhesus monkey (Macaca mulatta)

Area of Science:

• Primate anatomy
• Developmental biology
• Comparative anatomy

Background:

• Understanding craniofacial development is crucial in biology and medicine.
• The rhesus monkey (Macaca mulatta) is a widely used model organism for studying growth and development.
• Quantitative data on normal mandibular growth is essential for comparative and experimental studies.

Purpose of the Study:

• To quantitatively and qualitatively analyze mandibular growth in rhesus monkeys.
• To document growth patterns across different developmental stages.
• To provide normative data for mandibular growth.

Main Methods:

• Analysis of 42 rhesus monkeys across four age groups: infant, juvenile, adolescent, and young adult.
• Superimposition of serial cephalograms on mandibular implants to collect growth incremental data.
• Observation of 57 growth periods to assess skeletal and dento-alveolar changes.

Main Results:

• Mandibular growth and remodeling were most pronounced in infant monkeys and decreased with age.
• Posterior relocation of the ramus occurred in all age groups.
• Bone deposition on the mandibular body and dental changes were greatest in younger animals, stabilizing in adults.

Conclusions:

• The rate and direction of normal mandibular growth in rhesus monkeys vary significantly with age.
• Mandibular growth patterns differ between skeletal and dento-alveolar components.
• The study provides quantified normal mandibular growth values at defined maturational levels for future research.