Neural Exam - 3 month reflexes - asymmetric tonic neck

From Embryology
This infant is almost 3 months old.
  • The asymmetric tonic neck reflex is present in the first 3 to 4 months of life.
  • When the head is turned to one side, the ipsilateral arm and leg will extend while the contralateral extremities will be in flexion.
  • The baby should be able to overcome this reflex and move out of this posture.
  • If the asymmetric reflex is obligate (the infant can not move out of or overcome the reflex) or if the reflex persists beyond 6 months of age, then it is abnormal and can be seen in upper motor neuron disorders.


Links: MP4 version

3 Months Neural Exam Movies: normal behaviour | cranial nerves | Tone - head and trunk control | upper extremity‎ | hand movements | lower extremity Positions - supine | prone | ventral suspension | vertical suspension | Reflexes - Deep tendon reflexes | Plantar reflex‎ | Root | Moro | Galant | Grasp | Asymmetric tonic neck‎ | Neural Exam Movies | Neonatal Diagnosis
Movie Source - Paul D. Larsen  
Movies from the PediNeuroLogic Exam website are used by permission of Paul D. Larsen, M.D., University of Nebraska Medical Center and Suzanne S. Stensaas, Ph.D., University of Utah School of Medicine. Additional materials were drawn from resources provided by Alejandro Stern, Stern Foundation, Buenos Aires, Argentina; Kathleen Digre, M.D., University of Utah; and Daniel Jacobson, M.D., Marshfield Clinic, Wisconsin. The movies are licensed under a Creative Commons Attribution-NonCommerical-ShareAlike 2.5 License.
Links: Neural Exam Movies | Movies



Cite this page: Hill, M.A. 2017 Embryology Neural Exam - 3 month reflexes - asymmetric tonic neck. Retrieved November 18, 2017, from https://embryology.med.unsw.edu.au/embryology/index.php/Neural_Exam_-_3_month_reflexes_-_asymmetric_tonic_neck

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© Dr Mark Hill 2017, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G